Software/Hardware FPGA Dev Board that runs Linux
bforsse writes "The ML300 allows engineers to develop
hardware with HDL synthesis/simulation and software with standard GNU tools. The entire system is implemented inside one FPGA with an integrated IBM PPC processor. The board comes with all the peripherals that a standard motherboard or laptop has and then some.
It currently ships with MontaVista Linux, a number of other linux flavors and OSs are in the pipeline. Maybe this new merging of the hardware and software worlds will settle some of the religious wars between hw and sw engineers?...ok, maybe not."
Icarus (http://www.icarus.com/eda/verilog/) is a competent Verilog (not VHDL) open source simulator. It even has some support for sythesizing to some FPGA libraries.
Verilog is more common than VHDL in the US, so this is the only open source HDL tool I've used. Primarily, we are still slaves to Synopsis and Cadence though.