A Directory of Best-In-Class Open Source and Free Software Resources:
Office Software
Open Office, A Complete Office Software Suite Comparable to Microsoft Office.Notepad++, an excellent free replacement for Notepad, it is really excellent!
Security Software
AVG Anti-Virus is a great free Anti-Virus program.Operating Systems
Ubuntu Linux - A Great Linux distributionDSL Linux - a great, tiny, 50MB Linux distribution
DistroWatch - A Site that keeps up on all the current Linux distros.