picture editing

Goldberg is a freeware image and movie viewer with image editing capabilities

Jubler is a tool for editing text-based subtitles

Is a GPL licensed, cross platform multitrack audio recording and editing suite.

DVD post-authoring editing.

Notepad with some editing feature.

Image Tricks — photo and image editing software for Mac

Award winning video editing software

QuickTime Effects include 7 video editing effects plug-ins.

It is advanced video editing and compositing software with over 150 built-in.

geared towards viewing / editing Mac OS X's preference files