Yosys, nextpnr, Verilator, and LiteX as a baseline map for open FPGA tooling.
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Verilator
Open-source SystemVerilog simulator and lint system.
Verilator is used for simulation, lint, and SystemVerilog model integration with C++/SystemC.
The project card links to the official Verilator repository.
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Verilator compiles Verilog/SystemVerilog into C++/SystemC and is used in regression flows.