Animation

Tweener One of my favorite toolkits. Tweener makes it much simpler to create advanced animations. It has a Javascript version as well, which is a lightweight alternative to the Scriptaculous effects.

Visualisation

flare visualization toolkit Animation and graphs toolkit

Audio

POPForge This is actually a collection of several projects. One of the best is the audio class, which let’s you create audio samples [...]

Popularity: 43% [?]