Free Software, Organized by Function

"TOP 400 Freeware software!
FreeZiq (June 18, 2008)

An impressive list, divided into categories:

• Office
• Archive managers
• Internet
• P2P
• Chat
• Security
• Network
• Servers
• Audio
• Video
• Image
• 3D
• Developers
• CD/DVD
• Codecs
• System Ulilities
• UI Enhancements
• Hardware monitoring/Benchmarking
• Games
• Education
• Miscellaneous (things like VirtualPC - create virtual machines, and Scribus - professional page layout
• Wallpapers

As with any software, I'd do a little checking around before trying anything: but this looks like a good list.