Xilinx FPGA Design, Simulation and Synthesis Software
Xilinx offers a wide range of software tools to support design of Xilinx FGPAs. Tools include the Xilinx Integrated Software Enviroment (ISE), ChipScope Pro for real-time debug and verification, and the ModelSim Xilinx Edition III (MXE III) VHDL/Verilog simulator.
ISE and ChipScope Pro Evaluation versions are fully functioning versions of Xilinx design software with a 60-day time-limited license. ISE WebPACK offers free downloadable design tools with no time limit, limited to lower-density FPGA and CPLD design. All are ideal for the educational environment.
You can download the software tools from the Xilinx website