Only particularly interesting things are linked directly. If you want a more comprehensive overview you should follow the meta links. A free software database by ASME with a lot of engineering related programs. The fluids section contains many CFD related things. Several other sections might also be of interest.
Most programs are for the PC architecture.
The site is maintained by Culbert B. Laney as a part of the web site for his book Computational Gasdynamics . The main focus is on compressible flow solvers. Many of the software packages presented are free only to US citizens. You can also find links to mesh generators and visualization packages here. It is a very good compilation, probably the best of its kind on the net.