Free Software:

• The latest version of VPR , a placement and routing tool for FPGA research, is available from as part of the VTR (Verilog to Routing) source archive.
• VPR and T-VPack version 4.30; this is the version used in Architecture and CAD for Deep-Submicron FPGAs.
• The Titan23 benchmarks and the Titan flow enable large and complex circuits to be used with academic FPGA CAD tools.
• Nettovqm utility: nettovqm converts a VPR format netlist to the format needed by Altera's Quartus CAD suite, letting you interface VPack output to a commercial CAD system.
• VPR is part of the SPEC 2000 suite of computer benchmarks (the standard benchmarks used to determine the speed of various workstations). I have found it to be a good predictor of the speed of commercial FPGA CAD tools on various computer hardware as well. Results are here.
• EasyGL: An easy-to-use graphics interface for programming X11, PostScript, and now Win32 displays.