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Posted 07 October 2012 - 06:32 PM
Posted 07 October 2012 - 07:21 PM
Posted 07 October 2012 - 08:19 PM
"Since Q1 2007, binary version of PhysX SDK is free for commercial and non-commercial use." - source
Better read the license though, just in case (and I can't seem to find the actual license anywhere, so you probably need to download it to find out for sure).
You could also try Bullet, which is open source. (zlib)
OpenAL = Open source sound, if you use an earlier version. Later versions are proprietary, according to wikipedia. (Then why's it called "Open"?!)
Networking = Berkley sockets, but that's rather low level. ENET maybe? RakNet is higher level but is a commercial product.