Apple continues its co-operation with open source developers with the release of two further iterations of Darwin, the core of Mac OS X.

The company yesterday released source code for Darwin 6.7 and 6.8, which are available for download from Apple's Darwin Projects Directory.

These releases "correspond" to Mac OS X 10.2.7 and 10.2.8 respectively. Available software includes a "large number of source projects", including Apache, USB audio, and even Chess.

Darwin is Apple's open-source version of the BSD Unix operating system, and was originally released in March 1999. Apple's notes on Darwin reveal: "Darwin currently runs on PowerPC-based Macs, and is being ported to Intel processors and compatible systems by the Darwin community.