Project to develop a GPL VHDL simulator for Linux.

A VHDL simulator and implements nearly all VHDL87 and some features of VHDL93. GHDL is written in Ada95 and it is a GCC front-end. [Open source, GPL]

A synthesys tool, which will optimize your ASIC/FPGA/CPLD design. Evaluation license is available.

VHDL Compiler

A fast VHDL Compiler/Simulator [Freeware].