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What are free tools for HDL development for FPGA?
Are there any differences between the three tools you mentioned?
Yes, each tool has its own unique features and interface. Xilinx ISE WebPACK, for example, is known for its ease of use and wide range of device support. Altera Quartus II Web Edition is popular for its system integration capabilities and comprehensive debugging tools. GHDL is an open-source tool that allows for VHDL simulation on different operating systems.