track2rss (englisch)
This project seeks to provide a set of scripts for converting tracking information for packages from various carriers to the RSS format. It was inspired by a similar project written by Jason Young. Currently support is provided for UPS, Fedex Air and Ground, and the US Postal Service (USPS) via a set of XSLT templates and a Perl wrapper. Future plans are to extend support to more carriers such as DHL, etc.; possibly other formats such as Atom, and other languages like PHP, Java, etc.
http://track2rss.sourceforge.net/

Free RSS to HTML PHP Script (englisch)
Free PHP Script to display RSS feeds on Websites
http://www.feedforall.com/free-php-script.htm

blogspace.com - RSS (englisch)
Important News and information on the RSS format until 2001.
http://www.blogspace.com/rss/

Free RSS Graphic Tool (englisch)
Generate RSS graphics and buttons in seconds, with free RSS button tool from FeedForAll.
http://www.feedforall.com/public/rss-graphic-tool.htm

RSS Extensions (englisch)
RSS Extensions
http://www.rss-extensions.org/wiki/Main_Page

O'Reilly Network: RSS DevCenter (englisch)
O'Reilly Network's source for RSS developer news and information.
http://www.oreillynet.com/rss/

Feedo Style (englisch)
Feedo Style allows webmasters to add content to their websites. Feedo Style transforms RSS, RDF or ATOM feeds into stylish JavaScript news boxes and animated tickers, that can be easily included into any web page with a simple copy and paste. No programming knowledge needed
http://www.feedostyle.com/

FeedForDev RSS (englisch)
FeedForDev for developers, integrate RSS feeds into your applications and communicate with customers from within your program
http://www.feedfordev.com/

FeedFiles.Com (englisch)
FeedFiles - RSS, Atom and OPML Resources and Content.
http://www.feedfiles.com/

extralabs.com (englisch)
Software for creating RSS feeds and Podcasts.
http://www.extralabs.net/