Does WebPACK ISE work with third party synthesis tools?
Yes, the option is present to have the Xilinx environment variable set automatically when installing the 9500 series or XCR series family fitters, or you may add the following lines in your autoexec.bat file: set XILINX=C:\XILINX_CPLD (or directory location, if different) set PATH=%PATH%;%XILINX%\bin\nt; Save this file and exit. Reboot your machine. The XILINX variable is now set, and your third party tools should be able to run applicable fitting tools.