NVC is an alternative to GHDL, written in C. It seems to be way ahead of GHDL though: it has nearly full VHDL-2019 support and preliminary Verilog/SV support, while GHDL is still lagging on full VHDL-2008 support.
It also supports the VHPI interface required to use cocotb.
It's interesting to see that open source mixed language simulators are becoming a thing!
syntheticgate · 3d ago
Huge fan of nvc, can't recommend it highly enough! It is fast, has excellent language support and issue response on github is amazingly fast even though this is a hobby project. We're using it every day at work.
It also supports the VHPI interface required to use cocotb.
It's interesting to see that open source mixed language simulators are becoming a thing!