Here's a list of all the coolest open source software I could find. For all those people who don't want to or just can't afford to pay for Software! But if you can afford to donate a bit of change to help them out I would strongly encourage it.
AbiWord
Word processing software simmilar to NeoOffice but without all the other programs.
Acqlite
Gnutella file shareing app with no spyware or ads.
Adium
This is one of the best IM programs out there. Allowes you to connect to multiple servers including AOL, MSN, Yahoo, ICQ and more.
Armagetron Advanced
A 3D Game modeled off the Movie tron.
Audacity
A simple sound recording and editing program.
Blender
3D modeling Software.
Camino
Web browser similar to Firefox but designed only for the Mac. It's agreat browser but Firefox is still my Favorite.
Cashbox
Personal Finance managing program with some of the same features as Quicken.
CenterStage
Turn your Mac into a Media Center that you can connect to your TV. You'll need at least a G4/G5 processor. and OS X 10.4. I think this would be a great program if you had a Mac Mini but I haven't had the chance to try it on one yet.
Celestia
3D Planetarium software that recreates the experience of traveling through space.
Colloquy
This is a really cool IRC client.
Cube
First person shooter game.
CyberDuck
FTP and SFTP file browser for the Mac.
Democracy Internet TV Player
Built in Channel Guide with over 300 channels. Whatch video from Podcasts, RSS Feeds, Blogs, Web sites and more! All in full screen.
Firefox
Honestly the best web browser I've found for the Mac (or even that other opperating system). Includes Tab browsing, plugins and support for almost all websites (including secure bank sites).
FreeMind
Really cool note taking/mind mapping program.
Gimp.App
An easy to install and use Image and Photo editing program simmilar to Photoshop. I love this program!
HandBrake
DVD Ripping software that also converts into MPEG-4 and other video formats.
iPod Disk
iPod Riipping software that lets you get music off your iPod just like a regular disk drive.
Inkscape
Vector Graphics editing program simmilar to Illustrator and CorelDraw.
Jomic
This program alowes you to read online comic books from comic book archives.
Juice
Listen to your Podcasts when you want.
MPlayer
Play all the media file types you want in one media player.
NeoOffice
This office suite has everything you need including word proccesing and spreadsheets. IT's compatible with Word and OpenDocument file formats.
NVU
Web Site creating program simmilar to Dreamweaver.
Open Song
This is a great alternative to using Keynotes or Powerpoint to display songs in your Church, School etc... It allowes you to select different backgrounds and display Bible verses. I use this program all the time and I highly recomend it.
RSSOwl
This is a great cross platform RSS/Atom reader. If you use multiple Operating Systems but want to use the same RSS reader then this is the one for you!
Senuti
iPod Ripping software.
Smultron
Text/HTML editor.
Stepmania
Dance Dance revolution clone. You can play this game using a keyboard but you will need a dance pad to really enjoy it.
Thunderbird
This Email app is from the creators of Firefox and will meet any expectations you have as a result. It has great Spam Filtering and you can even customize the look and feel to suite your needs.
Transmission
BitTorrent program with an easy user interface.
Vienna
Great RSS/Atom feed reader.
VLC
Media player that will play more file formats than Quicktime.
