All of this software should be used at your own risk. 

To be able to simulate VHDL, you'll need:
savant-v1.01.tar.gz
warped-v1.01.tar.gz
tyvis-v1.01.tar.gz

Those files contain source.  For binary packages, check out the "packages"
subdirectory.

Send any/all feedback to savant@ececs.uc.edu.