iMovie plugin packs for OS9 and OSX. Some are free.

A QuickTime sound scripting environment that allows you to assign a number of sounds to ten independent channels, and have them play or loop individually under script control (as well as manually).

Software waveform and vector scope for Power Macintosh computers with video input capabilities. It performs realtime luminance and chrominance analysis of any video source, QuickTime movie or still image, allowing you to adjust your video digitizer's ...

Music visualization in real-time. Composer toolkit features drag-and-drop programming for visuals triggered by live sensors.

Creators of CourseBuilder and onViz. Allows users to create stand alone cross-platform software applications for multimedia production, presentations, teaching, and testing.

Step-by-step guidance for beginners.

Producers of HyperGASP, a multimedia authoring tool for educators and the HyperCard community. [Mac OS]

A video stabilizer plugin for iMovie. It eliminates camera shakiness and makes panning, rotation and zooming smoother.

Review of Apple's iMovie software.

A site offering plugin files for Macromedia Director.