Electric is a VLSI design tool with a long history, and it just went open-source. For the latest version, go here It supports VHDL, which should be of interest to the Freedom CPU project since they've decided to use VHDL (why not Verilog?). Unfortunately it does not support Verilog as of yet. Verilog is used in many CPU companies as many designers find it a more natural language in which to express state-machines.
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