A test version of the third major update that Apple will release for Snow Leopard already brings huge advances in 3D graphics when compared to the edition retail system, available since August 2009. The Hardmac note that OpenGL support will be improved on Mac OS X 10.6.3 with a new version (3.0), which already features 95% of all its features in the current beta version.
However, there is still a good way to go in developing the update until all of its functions are implemented, as many of them are not yet available. In addition, Apple began to implement support for versions 3.1 and 3.2 (described here) of the same technology, which will provide 3D graphics with a higher level of quality and realism for application and game developers, in addition to greater ease for programming and portability of projects.
OpenGL has been the main 3D graphics technology of Mac OS X since its first version and offers many benefits to compete with Microsoft's DirectX, including the fact that it is multiplatform. There are even game companies that don't even recommend using the graphic libraries found natively on Windows to encourage the adoption of open standards in game development.