feedparser is a Python library that parses feeds. It supports the Atom, RDF, RSS, and CDF feed formats.
Dataquay is a library that provides a friendly C++ API for the popular Redland RDF data store using Qt4 classes and containers.
listparser is a Python library that parses subscription lists (also called reading lists) and returns all of the feeds, subscription lists, and "opportunity" URLs that it finds. It supports OPML, RDF+FOAF, and the iGoogle exported settings format.
A Live Linux distribution with a focus on education.
A command line tool to output your database schema and data in diff-able form.