FCollada
FCollada is an open-source C++ library which offers support for COLLADA interoperability. It is written by Feeling Software and is used within many commercial products and engines as well as with Feeling Software's ColladaMaya and ColladaMax.
ColladaMaya is Feeling Software's COLLADA import/export plug-in for Maya. ColladaMax is Feeling Software's COLLADA import/export plug-in for 3dsMax. They offer unprecedented interoperability between these and other DCC tools and allow for painless and fast extraction of data from Maya and 3dsMax.