GFeedLine is a social networking client. It supports Twitter.
GPhotoFrame is a photo frame gadget. It shows pictures on the desktop from multiple sources: local folders, F-Spot databases, Shotwell databases, Facebook API, Flickr API, Picasa Web Album API, Tumblr API, and RSS.
Twitim is a Twitter client for GNOME. It features
XMPP connections, custom watchlists, sounds, and
A Web-based document management system.
Translation of an RCS file collection or CVS repository history as a fast-import stream.