Software

Apple -- AppleMac software

Distros -- Comparaison of operating-systems

Graphics -- Graphics tools and resources

Music -- Musical players, editors, and tools

Development -- Programming and software development tools

Educational -- Science, maths, and education software

Internet -- Internet clients, servers, and tools

Science -- Scientific and mathematical software

Games -- Computer games

Tools -- Useful things to have around

A-Z -- The A to Z of free software

Multimedia -- Toys, demos, and video-like software

Editors -- Text editors and code editors

Best

Office -- Word processors, spreadsheets, presentation and finance software...

Gnome software -- repository for GNOME software

Sourceforge -- Projects of the month at SourceForge