Fugu is a cross-platform application for creating animated 3D forms with code. It allows users to rapidly design animated, growing organic forms by writing scripts in Lua. It can make things like this:

Fugu runs on Windows and MacOSX.
Important Fugu is alpha software and will surely contain bugs; however, it should work well enough for you to enjoy it, so check it out and report any problems you have.
Fugu contains a number of examples demonstrating its functionality. Just go to the File->Examples menu. There is also an online function reference and a discussion site.
Fugu is open source! The source can be accessed at bitbucket and is governed by the GPL. Got bugs? Please report them as issues on the bitbucket site. Read my post-mortem here.
Current features:
Fugu was conceived and developed by Ben Porter, Jon McCormack and James Wetter, in association with CEMA and Monash University. This project was supported by funding from an Australian Research Council Discovery Projects grant #DP1094064.
Fugu depends on a number of open-source libraries and wouldn't exist without them. These include:
If you are interested in code and form, you might also want to check out these similar projects:
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