Here are my picks. Some of these are already included in some distros.
- GAIM
- Ximian Evolution (like Outlook)
- Mozilla
- PAN (Pimp Ass Newsreader)
- GIMP (Image Editor)
- apt-get for RPM, if a RedHat system
- SpamAssassin (kicks ass if you run your own mailserver)
- Gallery, an excellent PHP-based photo gallery
One last thing I want to mention, but not a Linux download:
- CYGWIN
CYGWIN is a port of the Unix API's to Windows. It includes many of the utilities and a compiler, and an X-Server. If you are forced to live in Windows land part time, it is definitely worth the download (
http://sources.redhat.com)