an interactive Web tool designed to assist teachers and students in producing reference citations for crediting information from other people. You merely...
a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program
a community driven resource for open source software. Try starting a page about your favorite project, syndicating a blog for a topic, or browsing through tags people have added to projects or pages.
Mailing lists are funneled into news groups. Gmane does spam detection, cross-post handling, has a TMDA-fueled encryption/forwarding service, a web interface, respects X-No-Archive, supplies RSS feeds, uses SPF, features user-defined filters, more...