• Online Tools
• Meebo.com - Access instant messengers from your web browser
• MeBeam.com - Web based video chat without setting up account
• TokBox - Web based video chat
• Internet Frog - broadband speed test
• Speakeasy Bandwidth Test - measures transfer rates to servers located across the U.S.
• Central Ops - domain, email and network testing from your web browser
• DNS Stuff - browser based DNS testing
• Whois - find out the registered owner of a domain and where it is hosted
• File Utilities
• FreeCommander - a dual pane file manager for windows
• 7-zip - simple application to manage common archive and compression formats
• TrueCrypt - cross platform disk encryption utility
• Internet Tools
• Firefox - fast, secure and customizable web browser
• Thunderbird - a pop & imap email client with powerful filtering capabilities
• Filezilla - cross platform ftp and sftp file transfer client
• WinSCP - scp and sftp dual panel file manager
• Putty - this is a  "no install" version that stores settings in the file system rather than the registry. The original putty can be found here.
• Graphics
• Irfanview - small, portable image viewer
• Xnview - view and convert between 400 different graphic formats
• VLC - cross platform media player that transcodes and streams almost any media format
• Productivity
• Open Office - an open source office suite (word processor, spreadsheet, presentation, drawing, database)
• AbiWord -  a small stand alone open source word processor
• Gnumeric - a stand alone open source spreadsheet
• PDF Creator - convert anything printable to a PDF file
• VPN
• Hamachi - a simple to install peer to peer VPN application
• OpenVPN - open source, cross platform VPN application
• VOIP
• Gizmo -  Free phone and instant messaging application
• Asterisk - open source telephone PBX
• Minisip - open source, cross platform SIP software phone
• Phoner Lite -  freeware VOIP softphone
• Operating Systems
• Debian - Linux distribution with a library of over 18,700 applications 
• Ubuntu - graphical Linux distribution built on debian and known for it's community of users
• Puppy - small but full featured Linux distribution that loads entirely into RAM
• DSL - a 50MB mini desktop Linux distribution that runs well on older computer hardware
• FreeNAS - 32MB Network Attached Storage Server based on monowall and FreeBSD 
• Remote Support Tools
• CrossLoop - connect to and control computers across the Internet
• ShowMyPC -desktop sharing and remote access to your computer from anywhere on the Internet