FPGAsm
Create fast bare-metal FPGA designs without Verilog or VHDL
... testing and physical test harness creation, radically changing the workflow.
FPGAsm offers you an opportunity to REALLY understand Xilinx FPGAs, create circuits DIRECTLY on the FPGA using an opensource tool, and share your knowlege and projects with the community.
Supported architectures:
Xilinx (via xdl)