MacTools

 Open Source Software ([|OSS]) for Macs is an oft-neglected topic so hopefully the recommendations below will serve to go some way to redress that imbalance!

well-known oss applications also available for osx

 * [|**Audacity**] (sound recorder & editor)
 * [|**Firefox**] ([|web browser])
 * [|**FreeMind**] (mind-mapping program)
 * [|**The GIMP**] (image editor)
 * [|**Handbrake**] (DVD ripper and video converter - formerly OSX-specific!)
 * [|**KompoZer**] (web page editor)
 * [|**Miro**] (HD video player & Bittorrent client)
 * [|**OpenOffice.org**] (and [|**NeoOffice**] - office suites)
 * [|**VLC**] (versatile video player)
 * [|**XMind**] (mind-mapping program - can host mindmaps online)

oss applications that are osx-specific
A wonderful, wonderful suite of programs is available for OSX called [|**MacLibre**]. This features a wealth of OSS, auto-updates, and is a graduate of the Google Summer of Code competition. I would recommend any Mac user to install this - what have you got to lose? More Open Source software for OSX is listed at [|**Open Source Mac**]. A more comprehensive list is available, of course, at [|**Sourceforge**].
 * [|**Adium**] (instant messaging client)
 * [|**Cyberduck**] (FTP client)
 * [|**ffmpegX**] (video transcoder)
 * [|**Q**] (an emulator allowing Linux, Windows and other operating systems to be run in a virtual machine)
 * [|**Quicksilver**] ('unified, extensible interface for working with applications, contacts, music, and other data')
 * [|**Romeo**] (control Mac via Bluetooth)
 * [|**Seashore**] (image editor)
 * [|**SimplyBurns**] (CD/DVD burning software)
 * [|**Transmission**] (Bittorrent client)