- iptux - Lan messaging and file sharing app. Works with ipmessenger on windows.
BansheeRhythmbox - Default media player for Ubuntu ( 11.x12.04 onwards). Plays music and videosonly.
- JDownloader - Download management app. Supports free-user-downloading from most online file hosting services. Doesn't always work well with Firefox + Flashgot.
- FatRat - Another download management app. Not as great as JDownloader though IMO. But works well with Firefox + Flashgot.
- FreeMind - Mind mapping tool
- Docking Tools ** -
- DConf Editor - For tweaking system settings. E.g. preventing/disabling automatic shutdown on critical battery level.
- XPad - Sticky notes
- zRam - Creates a RAM based block device which acts as a swap disk, but is compressed and stored in memory. See related blog posts here.
- PlayOnLinux - A front-end for Wine to run Windows applications on Linux.
- Meld - A diff comparision tool like WinMerge.
** A good comparision and review of the docking tools - http://www.hackourlife.com/awn-vs-cairo-dock-vs-docky-mac-style-linux-docks-reviewed/