Audacity - Freeware
Audacity is a free audio recorder/editor/mixer. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings.
Requirements: OS X 10.1 or later
CatDV - Demo
CatDV is a clip logging and cataloging application designed to enhance the productivity of video editors using an existing NLE application.
Requirements: OS X 10.4 or later
Handbrake - Freeware
HandBrake is a GPL'd multi-platform, multi-threaded DVD to MPEG-4 ripper/converter. HandBrake was originally available on the BeOS, but now has been ported over to MacOS X and to GNU/Linux.
Requirements: OS X 10.5 or later
Perian - Freeware
Perian is a free, open source QuickTime component that adds native support for many popular video formats.
Requirements: OS X 10.4.7 or later
Periscope - Demo
Modern, simple OS X webcam software for security, fun, stop motion, or time lapse photography! The next generation of web cam software that lets you use your iSight to capture activity and then save or share that image simply and automatically.
Requirements: OS X 10.4.10 or later
Sound Studio 3 - Demo
Slick Transitions & Effects are the premier plug-ins available for iMovie. This suite of plug-ins provide you with dozens of new tools to spice up your iMovies, while preserving iMovie's simplicity and ease of use
Requirements: OS X 10.4 or later
TunesArt - Freeware
TunesArt offers new features for iTunes: display cover art and track information on your desktop (many themes available), get notification on track change, display bezel notifications on play/pause/next/prev, search your iTunes Library, scrobble to Last.fm, display/edit/download lyrics, and support for Growl notifications.
Requirements: OS X 10.5 or later
VLC Media Player - Freeware
VLC (initially VideoLAN Client) is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, ogg, etc.) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.
Requirements: OS X 10.4 or later