Parsers
- node-feedparser by Dan MacTough (Javascript/nodejs) - Robust RSS, Atom, and RDF feed parsing in Node.js
- feedparser - (Python) Universal feed parser, handles RSS 0.9x, RSS 1.0, RSS 2.0, CDF, Atom 0.3, and Atom 1.0 feeds
- RSSPHP - RSS_PHP is a RSS Parser and XML Parser for PHP 5+, utilising the DOM to parse any valid XML Document including RSS, with provisional support for ATOM feeds.
- XML::RSS::Parser - (Perl) lightweight liberal parser of RSS feeds
Validators
- reader - JavaScript package for feed reading and aggregating
- RSS 2 HTML - offers an easy way to embed RSS feeds in web pages
- IFTTT - Provides tools to generate RSS feeds in response to triggers
- Tutorial on using IFTTT to monitor other RSS feeds and events to create feeds
- IFTTT page on using the RSS Feed service in IFTTT
- Zapier - Provides tools to generate RSS feeds in response to triggers
- TweetsToRss - A node.js app that periodically reads a Twitter account and generates an RSS feed from it.
- Granary - Fetches and converts data between social networks, HTML and JSON with microformats2, ActivityStreams 1 and 2, Atom, RSS, JSON Feed, and more.
- Twitter to RSS PHP Script - Script by Chris Hardie, see his blog post for more info
- OPML - Outline Processor Markup Language (OPML) is a common format for storing feed subscription lists and import/export of lists from one tool to another
Ways to display feeds in public