I recently came across the Open64 compiler chain,

• http://www.open64.net/ - the official Open64 homepage
• http://developer.amd.com/cpu/open64/pages/default.aspx - AMD's version of the Open64 compiler
• http://www.pathh64.net/ - this seems to be a movement to opensource the pathscale compilers and to buy up the customer database etc...
• open64

I was a bit surprised that I had never came across this compiler before, I had been more GCC and commercial compiler focused to have noticed this compiler. So far I have only installed it and compiled OpenMPI 1.3.3 for testing purposes. This may be a nice alternative to the Pathscale compilers which are pretty much dead in the water in terms of developement etc... till the company that used to maintain it gets sorted out.