Odin is a public-domain open source Verilog RTL Synthesis tool. Odin has algorithms that allow it to flexibly target different heterogeneous structures of an FPGA, and can be used as part of a CAD flow that connects to a commercial flow ,Quartus, and academic flow, VPR.
Executables are available for Linux and
is provided for those who want to modify the code or
for those who want to compile for other platforms. This
software is released under the Gnu GPL License