Pro and Indie Downloads:

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Chipmunk2D Unity, Indie, and Pro
Chipmunk2D for Unity
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Older Versions: Demo App Binaries:
Tutorials and Example Code
To download tutorials or example code, see the documentation page.
Git Access:

Chipmunk2D

Chipmunk2D's C source can be checked out from it's Github project

Chipmunk2D Pro

Chipmunk2D Pro customers have read-only access to our private Git repository. You just need to use the login/password you obtained when you purchased it.

git clone --recursive http://myLogin@chipmunk-physics.net/release/chipmunkPro/ChipmunkPro.git