A good place to start.

I'm setting up an open source directory where people can visit one site and get a list of all the best pieces of free software available. I will also use this as a place for reviews/comparisons of the open source software versus the mainstream version that costs money.

Here is a list I am borrowing from http://www.howtoforge.com Debian setup help guide.

Graphics:

• The GIMP - free software replacement for Adobe Photoshop
• F-Spot - full-featured personal photo management application for the GNOME desktop
• Google Picasa - application for organizing and editing digital photos

Internet:

• Firefox
• Opera
• Flash Player 9
• gFTP - multithreaded FTP client
• Thunderbird - email and news client
• Evolution - combines e-mail, calendar, address book, and task list management functions
• aMule - P2P file sharing application
• uTorrent - Bittorrent client
• Pidgin(Gaim) - multi-platform instant messaging client
• Skype
• Google Earth
• Xchat IRC - IRC client

Office:

• OpenOffice Writer - replacement for Microsoft Word
• OpenOffice Calc - replacement for Microsoft Excel
• Foxit - Adobe Acrobat replacement
  
• GnuCash - double-entry book-keeping personal finance system, similar to Quicken
• Scribus - open source desktop publishing (DTP) application

Sound & Video:

• Amarok - audio player
• Audacity - free, open source, cross platform digital audio editor
• Banshee - audio player, can encode/decode various formats and synchronize music with Apple iPods
• MPlayer - media player (video/audio), supports WMA
• Rhythmbox Music Player - audio player, similar to Apple's iTunes, with support for iPods
• gtkPod - software similar to Apple's iTunes, supports iPod, iPod nano, iPod shuffle, iPod photo, and iPod mini
• XMMS - audio player similar to Winamp
• dvd::rip - full featured DVD copy program
• Kino - free digital video editor
• Sound Juicer CD Extractor - CD ripping tool, supports various audio codecs
• VLC Media Player - media player (video/audio)
• Real Player
• Totem - media player (video/audio)
• Xine - media player, supports various formats; can play DVDs
• GnomeBaker - CD/DVD burning program
• K3B - CD/DVD burning program
• Multimedia-Codecs

Programming:

• Nvu- WYSIWYG HTML editor, similar to Macromedia Dreamweaver, but not as feature-rich (yet)
• Bluefish - text editor, suitable for many programming and markup languages
• Quanta Plus - web development environment, including a WYSIWYG editor