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I'm super-jazzed to release my AU Library. This falls firmly into the "Other" category, offering 12 different sections to help you write great programs. They range from simple programming utilities to make everyday tasks a little more convenient (like choosing and re-using lists of items, a variety of blending curves, a variety of easing curves, many repeating wave shapes, and some new distance functions), to a bunch of useful objects (including a camera for making motion-blurred animations, stacks of 2D fields of floating-point data, a controller for multi-step animations, and a utility for finding equally-spaced points on Catmull-Rom and Bezier curves). The library is extensively documented, with a ton of examples. Come and get it!
The overview document is at http://www.imaginary-institute.com/resources/TechNote03/TechNote03.html
Download the library at http://www.imaginary-institute.com/resources/AULibrary/AULibrary.php