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I have made some research and found that bullet, ode, newton and some others are open source physics engines that should be portable enough (but I have never tried to comile/use anyone of them on phones). I am writing my games for mobile platforms in C++, so the engine should be C or C++. I need a fast engine, since mobile platforms have limited resources. I need a free engine. A good design would be nice to have too.

What engine is best suited for my task? What I really would like to hear from you is your direct experience.

Documentation and support (for example, forum or an IRC channel) is a really important aspect to take into consideration.

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I'm in a similar situation... Looking forward to a good answer. – Coyote Dec 5 '11 at 13:17
As a mater of fact I started with bullet after looking around for quite some time. Since I started browsing in 2009 I saw bullet evolve and gain more support. It was used by some of my coworkers and it works... So ATM I started integrating bullet tentatively into my mobile engine. – Coyote Dec 5 '11 at 14:02
Voting to close as "which technology should I use?" questions are now off topic according to the FAQ. – doppelgreener Oct 1 '12 at 22:38

Bullet Physics is the choice I'd go with if you absolutely require opensource. It's pretty much THE choice in your situation. If not, physx and havoc both have non-commercial licenses.

Here is a more complete list

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+1 for Bullet. It's well docummented, and has plenty of tutorials and examples on the web. Don't know about the support part though. – dreta Feb 3 '12 at 22:11
Bullet's primary developer is an employee of Sony. I don't think commercial support is available for Bullet, but the Bullet Physics forums are always helpful. – i_grok Feb 4 '12 at 15:40

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