The Unarchiver is a simple-to-use and more powerful replacement for "BOMArchiveHelper.app", the archive unpacker software included in Mac OS X.

This free software edited by Apple is an absolute must-have, probably one of the best audio players.

Edited by Nullsoft, Winamp is a fast and reliable freeware which can play almost all the audio (mp3, wma, ogg, wav, cda...) and video (avi, wmv, mpg, divx, xvid...) files.

Blender is an open-source 3D modeling and rendering program that lets you create professional-quality animations.

Proposed by Google, this freeware is the light version of SketchUp Pro, an advanced 3D modeling application.

This free, multilingual, multiplatform office suite is the only one  which rivals the domination of Microsoft Office. Its documents are compatible with all the major commercial office suites.

If you can't play a video file with a non-common codec on your usual media player, VLC Media Player may solve your problem.

With this free utility (for Mac OS X only), making screenshots of webpages has never been so easy and quick.