Conduit - Open Source Sync Tool

If you’re using GNOME, Conduit is an open source app that allows the user to synchronize information to and from various destinations. This is an open source file synchronization tool synchronizes files, photos, emails, contacts, etc to another computer or device.

Clementine - Open Source Music Player

Clementine is a open source music player and library organizer. It is a port of Amarok 1.4 to the Qt 4 framework and the GStreamer multimedia framework. It is available for Unix-like, Windows and Mac OS X. Clementine is released under the terms of the GNU General Public License. Clementine was created because the Amarok transition from version 1.4 to version 2 and the shift of focus connected it. This was criticized by many users so as a consequence, Clementine was established, based on Amarok 1.4.x. The first version of Clementine was released on February 2010.

WinPooch - Open Source Antivirus

WinPooch Support Services

Winpooch is open source protection from spyware and the like. By scanning files in real-time on your computer, it detects any malware and makes sure they do not infiltrate your system. Together with ClamWin anti-virus program it even protects your PC from virus by adding the real-time scanning capability that ClamWin lacks. Winpooch sees and prevents all attacks from viruses, spyware, trojan programs, etc.

Banshee - Open Source Music Player

Play your music and videos. Keep up with your podcasts and Internet radio. Discover new music and podcasts. Keep your portable device loaded with good stuff.
Banshee is a cross-platform open-source media player, called Sonance until 2005. This open source music player uses the GStreamer multimedia platform for encoding and decoding various media formats, including Ogg Vorbis, MP3 and FLAC.