These are some of the open source software and freeware that I use.
Feel free to try them.

Name of Free Software Description Web Site to Download
Open Office Microsoft Office compatible program www.openoffice.org
FreeMind Mind mapping software freemind.sourceforge.net
AbiWord Word Processor www.abisource.com
Evernote Note Taking Software www.evernote.com
Gimp Photoshop type program www.gimp.org
Inkscape Illustrator type program www.inkscape.org
Blender 3D Drawing Program www.blender3d.com
7-Zip Winzip type program www.7-zip.org
Really Slick Screensavers Screensaver www.reallyslick.com
Picasa Google's Photo Organizer Software www.picasa.com
KeePass A password safe. www.keepass.info
     
Clamwin Anti-Virus Software www.clamwin.com
Microsoft Anti-Spyware Anti-Spyware www.microsoft.com/antispyware
SpamPal Anti-Spam www.spampal.org
     
Filezilla FTP Software filezilla.sourceforge.net
Firefox Internet Browser program www.mozilla.com/firefox
Thunderbird Email Software www.mozilla.com/thunderbird
Gizmo Internet Telephony www.gizmoproject.com
Skype Internet Telephony www.skype.com
     
Winamp Music Player www.winamp.com
VLC Multimedia Player www.videolan.org/vlc/
Audacity Record/Editing Sounds audacity.sourceforge.net
Mixxx DJ Software www.mixxx.org
     
Rocket Dock Application Launcher www.rocketdock.com
VirtuaWin Multi-Desktop software virtuawin.sourceforge.net
Virt-Dimension Multi-Desktop software virt-dimension.sourceforge.net
     
     
TightVNC Remote PC Control www.tightvnc.com
     
FlightGear Flight Simulation Game www.flightgear.org
America's Army 1st Person Shooter Game www.americasarmy.com
Stellarium Planetarium www.stellarium.org
Celestia Space Simulation www.shatters.net/celestia
Little Fighter Cute fighing game www.lf2.net
StepMania DDR Dancing Game www.stepmania.com
     
   
     
     

If you have other open source software or freeware that you use and think it's useful and would like to share with others, you can send the web site address to me through jason [at] webmage [dot] com.  thanks!