<i>"Oh hey look at all of the FOSS software we are using but not providing back to."</i><p>This page is just a central place for Apple to publish the corresponding source code for all of their released software. Among other things, this is a simple way to comply with licenses that require source availability, like the GPL.<p><i>"What else has apple given back to the open source community..?"</i><p>They released all their work on WebKit (including a whole new JavaScript VM) since forking it from KHTML, and have also done a good job of managing it as a real open source project (i.e. accepting outside bug reports and contributions, and giving commit privileges to people outside of Apple).<p>They've also made major contributions to LLVM, and released Clang (their LLVM-based compiler for C/C++/ObjC).