Add-ons/Linkrolls:

• Feed2JS.org:  Have changed domain name. RSS javascript generator with some pre-made styles. Also for download. Alternative links: 1, 2, 3, 4
• Feed Digest: generator with mixer, filter, international settings and manual or premade templates. (login required.)
• FeedRoll: RSS to JavaScript Converter with style options.
• feedfeeds:  iframe blogroll, 10 days trail (login required)
• feeds4all: Has a short linkroll script.
• Feedostyle: Scrolling linkroll generator with a lot of options
• Tickermyfeed: scrolling feed generator with color and size options.
• FeedSweep by howdev.com: Feedroll generator, has several styles and Advanced version with lots of options. You can also syndicate your LiveJournal with your LJ username.
• Rapidfeeds: PHP, ASP, javascript and iframe Linkroll generator and manager. (login required)
• RSS feed widget by musestorm. Simple copy past RSS widget.
• RSS to JavaScript Converter by BlinkBits.
• RSS to JavaScript Converter by globalsyndication
• RSS-spider News Wizard
• RSS-xpress Lite from UKOLN at the University of Bath: RSS to JavaScript Converter
• RSS2GIF:  This is like a button, an auto-updating image showing your latest entries.
• RSSinclude: RSS to JS, Iframe or PHP with simple visual options.
• RSSPECT: HTML2RSS, RSS2JS. (login required.)
• RSS/RDF/ATOM Converter v4.0
• RSS/RDF/ATOM to JavaScript Scroller 1.0
• RSS/RDF/ATOM to JavaScript Boxes 1.0
• Bitty: Webpage browser, create from URL, RSS, OPML, Blogmarks, Icerocket...
• activeRoll Wizard: For OPML with style options, script to copy paste or download.
• Grazr: Creats an interactive linkroll/rss reader from OPML.
• Optimal Widget Generator: from OPML
• Opod: AJAX OPML and RSS viewer widget
• Wizz RSS Reader-publish: Let's you publish your online Wizz reader OPML (requiers Firefox plugin), has 3 styles.
• My Timelines: Ajax DHTML widget that shows a feed in a timeline.
• Technorati Widget: Your Technorati favorites in a linkroll (login required)
• JavaScript RSS box viewer: RSS box viewer can display the formats RSS 0.91, RSS 0.92, RSS 1.0 (w/o modules), RSS 2.0 and Scripting News 2.

• Buttons: Showing you have RSS enabled is important.
  • feed icons: RSS icon to download in PDF, SVG and Adobe AI
  • OPMLIcons.com: The OPML.org icon project icons, also in PDF, SVG and AI.
  • Chicklet Creator: Generates code to many many RSS readers for all major Blog engines. [Alternative link]
  • Blogflux: Alternative landing page, leads to 11 rss readers. [example]
  • Feedbutton.com:  Generates a button that popups a choice of 8 buttons.
  • Feedpass:  Alternative landing page, leads to a page full of subscription options, readers, email, social bookmarks... and help for beginners.[example]
  • feedicon20: Like the above, available in japanese. [example ]
  • Add to Any: By MicroPat. Multi RSS button and to social bookmark services
  • iFeedReaders:  Alternative landing page for either RSS or social bookmarks.
  • MultiRSS: Multi RSS button for subscribing to near 40 major RSS readers.
  • SoloSub: Multi RSS button to over 8 major RSS readers.
  • Syndication Subscription Service: Multi RSS button to 18 services.
  • SingleSub: Multi RSS using a special URL to subscribe to over 50 services, email notification included. See example
  • quickSub: Multi RSS button that shows the over 20 links when you hover over the button and more.
  • RSS Subscription Options: Multi RSS button that popsup a box with buttons to 10 major services, requires access to template's head.
  • Feedzilla subscribe button: popsup a list a readers.
  • Feedburner FeedFlair: Feedburner's FeedFlair can generate javascript codes for many blog platforms that will display the buttons you have choosen, there are much more than subscription buttons.
  • PopMarks!:  by Greg Hill and 3spots. Customizable javascript code. Multi tool button for Blogger, WordPress and Typepad. There are much more than subscription buttons.
  • Rapidfeeds: Has a quick button to let readers create a linkroll of your site.
  • Technorati: Let readers add you Blog To Technorati.

Builders/Generators:

• Blogstreet RSS generator (no login)
• instantRSS: Online simple RSS generator or for download.
• Feed43: HTML2RSS (login required.)
• FeedFire: HTML2RSS (login required.)
• FeedTier: HTML2RSS (login required.)
• FeedYes: HTML2RSS (login required.)
• Free RSS Feed Writer:  (no login)
• Geofeed: To create a "geographically aware" feed by entering the URL of a feed.
• IceRocket Free RSS Builder (login required.)
• Linkrss: Simple service to create and store feeds.
• Ponyfish RSS Feed Builder: Unregistered account feeds expires after 7 days of inactivity.
• RSS generator: RSS Feed generator using regular expressions.
• RSSPECT: HTML2RSS, RSS2JS, email notofication. (login required. Free up to 5 feeds.)
• RSSgenr8: [RSS 0.92.] (no login)
• RSSxl Beta: [RSS2.0] (no login)
• RSS Headliner: RSS Builder.
• Sabifoo: feed generator though IM
• Yellowwheel RSS Feed Generator: [RSS2.0] Manual creation. (no login)
• XHTML-to-RSS Extractor: [RSS1.0] only from XHTML. (no login)
• ROR Generator: ROR is a rapidly growing XML format for describing your website. To create your ROR file, just enter the information below and press the button.
• Poderator: Stores your podcast MP3 files and help you create the XML files. (login required.)
• RSS Writer: download for windows and Mac os X

• Atom2RSS
• Free RSS Tools: Has a RSS Creator, RSS Editor, RSS Publisher, RSS Validator and a RSS Viewer
• lazytom's FeedJumbler: This does many things: RSS javascript generator, Convert a RSS or Atom-based feed into RSS, Atom and/or HTML and JavaScript, Merge/splice several RSS or Atom-based feeds into one combined RSS and/or Atom feed.
• RSSPECT:  HTML2RSS, RSS2JS, and also does email notofications. (login required.)
• RSS2WAP: RSS to WML for access on WAP devices (RSS2WML, RSS WAP or RSS-to-WAP).
• Feedsplitter: Feedsplitter is a PHP script that converts RSS or RDF newsfeeds into HTML, Javascript, or whatever format you want. For PHP enabled servers.
• myelin: Feed Normalizer: Converts any feed to RSS2.0
• PHP RSS Parser: creates a PHP code that will display a RSS feed
• rss2pdf.org: RSS/OPML to PDF or mail. [alternative link]
• RSS 2 PDF.com: converter.
• wos2bib: Converts from Web of Science, NCBI and similar databases or bibTex and XML files to bibTex, XML or layouted Output. There is also command-line version.
• OPML workstation: powerpoint 2 OMPL
• podcast RSS feed generator by tdscripts.com
• Feed2Podcast
• TechDrip.com: RSS to mobile RSS
• read.io - Baustelle: takes your weblog entries via your RSS feed, automagically converts your posts into spoken words and gives you back your very own podcast.
• Free RSS to HTML PHP Script: for download.
• RSS to JSON: for download.
• XOXO Tools:
  • Outline Converter: XOXO, OPML, RSS 1.0, RSS 2.0, ATOM, JSON (raw), Arbitrary XML to XOXO, OPML, JSON
  • Feed 2 XOXO Blog Format and hAtom: Turns a feed into XOXO Blog Format - compatible hAtom.
  • XOXO Blog Format, hAtom 2 RSS: XOXO Blog Format, hAtom to RSS
  • Standardise RSS: RSS, ATOM, hAtom, or XOXO Blog Format feed (as well as some Active Channel content and other miscellaneous feed formats which are not 100% supported) 2 'standardised' core RSS 2.0

• Feed Validator: Atom and RSS also for download.
• Fee RSS Toll Validator
• Ben Hammersley: XHTML Validator to RSS: A magical URL, Automaticaly validates thought your RSS feed reader, you will only see something when there's an error.
• Experimental Online RSS 1.0 Validator
• help4web Validators: Have put together all the validators you need. (HTML, XHTML, CSS, RSS, RDF and more)
• Redland RSS 1.0 Validator
• RSS 1.1 Feed Validator by inamidst.com
• RSS Validator at rss.scripting.com
• OPML Validator
• Weblogs feed Validator
• W3C Feed Validation Service, for Atom and RSS
• Simple AJAX Feed Reader: has a debug mode.
• Simple Ajax Exposed: Shows XML input
• XML well-formedness checker and validator: XML checker by URL
• XML.com RUWF: XML cheker by URL or direct input.
• STG's validator: XML cheker by URL, local upload or direct input.
• xFruits: Social or private: mix(RSS/Atom/OPML), RSS2xHTML, RSS2mobile, RSS2PDF Now with Chinese language support. (login required.) [mix example]
• XOXO Validator: Validates Microformat XOXO

• FeedBurner: A very complete service that will manage, track with click though, export (CVS, Excel) and has many side tools such as badges, feed count button...
• Kinja
• PubSub: Service that lets you track keywords and generates an RSS you can subscribe to.
• Socialmeter for feeds
• FeedPublish: Multi tools, mix and trac.
• Rapidfeeds: Create, Publish an track
• Saved Search Pro: enables you to create advanced eBay searches and delivers them to you every day via a single email or RSS feed.
• Stats Tools: by Big in Japan. To come.
• Montastic: Website monitoring tool, notifies when sites go down or comes back again. Notifications via mail or RSS.
• Free Bidding Tools: Generates a feed for tracking eBay auctions.
• Weed: Open source experimental statistics application. Possibility to participate to the public statistics by adding a code to your website. Download version available.
• RSSwatcher: Let's you track keywords in feeds

• FeedFinding: Generates a URL from one or several RSS feeds, where you change the [SEARCH TERM]
• Feedgit:  Search Engine RSS feed generator. Shows results from Digg, Google, Blogs, image search...
• Feedshifter: Ajax application. Free demo allows 5 entries. (login required.)
• BlogSieve.com: Advanced Feed Processing for Atom, RDF and RSS with filtering, merging and sorting.
• mySyndicaat: aggregates, filters and let's you search though your own feeds. (login required.)
• ReFilter: Simple filter (no login)
• weblog: RSS filter (login requiered)
• ZapTXT: Mail with filter (login requiered)
• Feed Rinse: url list and file upload. Login required. free up to 4 filters. (login requiered)
• Feed-Directory: Advanced search with filtering
• Touchstonegadget: Closed Alpha. Software for windows, Filtered Feed reader and manager

• Publi.sh!: Disposable feeds for personal and groups, also by HTML mail
• feedblendr: Mix and Upload OPML
• Feed Digest: Mixer, converter.. statistics to come. (login required.)
• FeedJumbler: Merge/splice several RSS or Atom-based feeds into one combined RSS and/or Atom feed. RSS javascript generator, Convert a RSS or Atom-based feed into RSS, Atom and/or HTML and JavaScript.
• Frankenfeed: Generats a master feed. (login required.)
• RSS Mix: Simple mixer
• Feedpublish: RSS Mixer. (login required.)
• FeedShake: merge, sort and filter multiple RSS, Atom feeds and Podcasts.
• fwicki:  Online reader with statistics and mixer with custom display.
• xFruits: Social or private: mix(RSS/Atom/OPML), RSS2xHTML, RSS2mobile, RSS2PDF (login required.) [mix example]
• Speedyfeed: Social, mixe, tag and read.
• Suprglu: Centralizeses information from other social software and let's you browse them by tag. (login required.)
• Peoplefeeds: Same as above using gloabal tags. (login required.)
• Profilactic (beta):  Centralizeses information from other social software My Space, Flickr, YouTube, Facebook, Digg, del.icio.us, Blogger, Vimeo, Zooomr..
• Ufeed: Presettings for flickr, del.icious and blog feeds. Creats a public or private (example) (login required.)
• Atiki.com: Social mixer. Let's you also manualy list rss links to create a feed.
• feeds.reddit.com: Social mixer. (login required.)
• RSSor: Social mixer.
• Feedbite, myFeedz: Social mixer.
• Feedcollectors: Social mixer.
• Aggrssive: Social mixer and bundel.
• Feedbite: Social, create and search bundels
• BozPage: Creates a social custom single webpage aggregator.
• FeedRaider: Like the above but private and with a custom favicon.
• RSS DJ: Social mixer
• Kickrss:  Combines RSS or ATOM feeds witht an easy-to-remember URL. (login required.)

• 2RSS: Simple online reader.
• rss.s2ch.net: Online RSS reader in text format also for mobiles.
• BozPage: Has 3 views, originaly made to create a custom RSS startpage.
• Almondrocks: Online Ajax reader with automatic RSS detection from URL and import from OPML. Use the one click automatic guest account creation
• AJAX Feed Reader Simple and AJAX Feed Reader Complex
• Complex Reader: from OPML upload.
• Feedbucket: Online reader (No login required)
• RSS Reader Highlights: Lists the latest headlines also showing feeds email. [bookmarklet]
• RSS Mad: Aggregator with a public reader.
• Chrysanth NETime Channel [RSS/ATOM/XML/RDF]
• Philter's RSS News Portal: [RSS 0.91]. Flash RSS reader.
• Blauerbot OPML reader: Has prefilled URL of most social bookmarking services where yu just need to writ in a tag.
• iPing Online Reader
• Mapped up: Dynamic social RSS aggregator with a map view using tags and Flash. 
• Nowsy: RSS customizable Dashbord. (no login)
• Yodpod: optinal registration.
• Simplepie demo: RSS and Atom syndication feeds.
• Plusmo: The demo simulates a mobile view of a custom feed.

• Blogdigger: Shows blog feeds and let's you subscribe to search results.
• Cityfeeds: search feeds by city
• Feeds for me
• Feed Findings: Let's you search keyworkd in a list of feed you enter.
• FeedMeme.com: Feed search and discovery with direct links to javascript and mobile converted links
• Feedster: Search Blog, News, Podcast or all.
• Live Search Feeds beta. Live.com's new Feed search engine.
• RSS Micro: OpenSearch engine built with AJAX with clustering search results
• Scoopgo: Let's you create your own RSS search engine.
• Searchfeedr: Let's you search a feed. [via]
• Search4RSS: Search in title, description or URL
• Nooked: RSS search by tag. Search results in RSS and OPML

• OPML search: OPML search engine. RSS, OPML, Podcasts/Audio/Video, Categories..
• Complex Reader: Online OPML reader from OPML upload.
• Live Search OPML Generator: Generates an OPML file from your query.
• Share Your OPML: Place to search, see who subscibed to where and share your OPML file
• OPML Wishlist: Ning Application to list features you would like.
• Opml Loader: Online OPML reader
• Optimal: Online OPML reader, input OMPL file URL
• OMPL manager: Online OPML manager and editor
• Kosso's OPML manager: Online OPML editor with drag and drop.
• ijot: OPML editor
• OMPL workstation: Online OPML editor, manager, converter... with sharing options. (login required)
• OPMLsearch: OPML search engine.
• OPML surfer: Online OPML reader. Enter the URL of an OPML file or the URL of a Webpage that has autodiscovery to an OPML file
• Feedshow OPML Builder: OPMLBuilder lets you create an OPML file from a list of RSS url or from url with wildcard filtering options. (login required)
• Feedshow "Really" Share-Your-OPML:  Just enter the Url of the page from which you want to create an OPML file. [via]
• OPML Generator: Paste a list of rss-feed urls into the textarea and submit to convert into an OPML file.
• Feedvault by Big in Japan. OPML backup with shareing options. (login required)
• Tagjag: (aka gada.be) Outputs OPML for every quiery.
• OPML Validator
• Ziki: Lets' you upload and share your OPML
• OPML Sampling: Server side script to Build a Page Showing the “Best” Item From Each RSS Feed from OPML, requires a Yahoo API key. See example.
• Taskable: RSS and OPML browser built into the Windows taskbar notification area.
• OPML Editor: for Mac and windows

• Beeplet: Event reminders using RSS, IM, SMS
• Reminderfeed: Create a reminder message that will be delivered by feed. (no login)
  
• RSS To Mail/IM...:
  • Beeplet: RSS to Email, SMS, IM notification, statistics using tags. (login requiered)
  • BlogAlert: (no login)
  • Bloglet: Blog mail.(login requiered)
  • Blogarithm: Blog mail (login requiered)
  • BlogFlux Subscriptions
  • Bot A Blog: email notification (login requiered)
  • Diffbot: Private Beta. RSS manager and notification. (login requiered)
  • feed2mail.org: Has a copy past code for an email subcription box. [alternative link]
  • InstantFeed: by Big in Japan. RSS or Atom to IM (MSN Messenger, Jabber, AIM and ICQ.) with an autodiscovery bookmarklet.
  • rss2pdf.org: RSS/OPML to PDF or mail
  • FeedBlitz: Notification, Customize look (logo,title...) and monitoring. (login requiered)
  • Feedcrier: RSS to IM
  • Feedlinx: RSS reader with several tools and email subscription
  • Feedwhip: RSS to mail with filtering. (login requiered)
  • FeedMail.com: Two way email to RSS service.(login requiered, complete for now)
  • FeedBurner: Complete service to track, convert... with a lot of tools. (login requiered)
  • immedi.at: RSS to IM
  • Loopnote: To come. Mail, IM, SMS notifications.
  • Mailfeed: by Big in Japan. To come
  • MSN Alerts: MSN Messenger, email and mobile. (login requiered)
  • Queoo: email and IM (login requiered)
  • PubSub: Keyword RSS notification. (login requiered)
  • Rasasa: RSS to email, IM, SMS notification with filtering.(login requiered)
  • RMail: RSS and OPML notification service with mobile support (no login)
  • RssFwd: RSS notification service. (login requiered)
  • RSSPECT:  HTML2RSS, RSS2JS, email notofication, reader and statistics. (login required.)
  • Simplyheadlines:  Email subscriptions, this service can advise you, let's you describe what or/and add your own feeds.
  • Squeet: RSS notification service (login required.)
  • Yutter: Notification, Customize look (logo,title...) and statistics. (login requiered)
  • ZapTXT: Filtered email notification (login requiered)
  • Zookoda: Advanced email subcriptiom manager. Has Daily, weekly or monthly subscriptions.
  • Feedlinx WordPress Plugin: Email Subscription plugin for WordPress.

• Mail To RSS:
  • dodgeit : Annonymous email with RSS (no login)
  • Mail2RSS: Turns email into feeds. (no login)
  • MailBucket: Turns email into feeds. (no login)
  • Send2RSS: email to RSS (login requiered)
  • SocialMail: Turns email into feeds.(login requiered)
  • MailFeed: by Big in Japan. email notification (login requiered)
  • Gmail: Let's you read all you email as RSS feeds (login requiered)
  • FeedMail.com: Two way email to RSS service.(login requiered, complete for now)
  • MailFeed: PHP script that let's you read mail as a feed.
  • Pop2RSS: local application, POP mail to RSS
  • SocialMail: by Big in Japan. email2RSS
• Webpage notification For webpages without syndication:
  • Changenotes: Mail update notification for pages with no sydication.
  • Watch That Page(login required)
  • TrackEngine: For website owners with all the new content highlighted (login required)
  • Change Detection (login required)
  • InfoMinder: Update notification for webpages without syndication and feeds (login required)
  • ChangeDetect: Update notification manager like online bookmarks using folders, notifies by mail, ICQ or sms. For US only.
  • Trackle: Let's you monitor a list of websites every hour and recieve them all in one mail.

• FeedXS: Feed Publishing.
• MetaRSS ifeed: Publish feeds with podcast support.
• Rapidfeeds: Feed Publishing with podcast support.
• reblog: Free. For server side A way of repubshing posts using RSS feeds. Has a 'refeed' and includes a Movable Type and WordPress plugins. [Video Tutorial][download]
• reBlogger: For server side use. Mixed, filtered, track to republish posts.

• Dappit: Advanced tool for generating many formats from a website, XML included, to build it's API.
• FeedCatch: Can save feeds with date options.
• MetaRSS: Multiple tools, Reader, Meta search, Keyword feed generator and publish. available in multiple languages. [demo]
• myComments: Wordpress and Textpattern Plugin for enabling comments RSS feeds.
• RSScache.com: Caches feeds to save bandwidth.
• RSS Autodiscovery Tag Generator: The RSS link you put between the HEAD tags so the browser can detect it.
• RSS calendar: Online calendar with good RSS support
• Reeferss!: An invisible javascript code that logs referrers.
• Skinnerbox : Feed CSS style generator.
• Feed Collectors: Service to search and make collections
• Feedcraft: Feed Publishing. Track, manage, deliver. Free for one feed.
• Humanized: a project trying to make feed reading easyer.
• Gregarius: web-based RSS/RDF/ATOM feed aggregator startpage with tabs for download. Demo available.
• Webride:: Allows discussions with RSS feeds.
• URLFAN: Crawls feeds to display a list of the most buzzed links.
• Nativetext beta: RSS feeds with translation service! Registering still to come. Demo available.
• Nakatomi: Alpha. To come. Portal to community based social aggregation.
• BlogBridge Feed Library: For download, notifications in the system tray for Windows and Linux or Growl for Mac OS X.
• litefeeds: software for mobiles, lets' you subscribe to feeds, search, send emails, get email notifications and bookmark to del.icio.us

• RSS: filter and re-mix: Big comprehensive list of RSS filters and mixers
• List of Free Blog and RSS feed Submissions (no email either)
• Search Engine RSS generators  
• Aggregators: A community compiled table of web based aggregators with feature details.
• RSS readers at 2RSS: List of desktop RSS readers mainly for Windows and Mac.
• Free Blog Pinging services: List of places for manual pinging.
• Mouseover Boucing RSS icon
• FanganFinder 's All About RSS: Good and easy overview.
• Blogging and RSS Tutorial for the Average Webmaster: Very complete tutorial by Webblogerz.com (PDF ebook to download)
• Taking RSS Beyond Headlines

День RSS в Рунете придумал Miku и организовал конкурс, где основными спонсорами выступают:

• Торговый комплекс АСТРЭЙ
• Форум для вебмастеров Армада
• Международная биржа ссылок TNX

Подробнее об этом можно почитать на его блоге: День RSS в Рунете

Тезис Дня: "Интернет - это изобретение, которое дает Вам возможность ничего не делать, когда Вам нечего делать" SEO Философия от Bormaley