ghdl
Open-source simulator for the VHDL language. tldr-pages
On several platforms
Several platforms
Analyze a VHDL source file and produce an object file
ghdl -a filename.vhdlIdentifyElaborate a design (where design is the name of a configuration unit, entity unit, or architecture unit)
ghdl -e designIdentifyRun an elaborated design
ghdl -r designIdentifyRun an elaborated design and dump output to a waveform file
ghdl -r design --wave=output.ghwIdentifyCheck the syntax of a VHDL source file
ghdl -s filename.vhdlIdentifyDisplay help
ghdl --helpIdentify