OpSim written in Pascal/Lazarus, but seems abandoned since 2019. Also there is pychemqt, which is active.[0,1] [0] https://sourceforge.net/projects/pychemqt/

OpSim written in Pascal/Lazarus, but seems abandoned since 2019. Also there is pychemqt, which is active.[0,1] [0] https://sourceforge.net/projects/pychemqt/ https://sourceforge.net/projects/pychemqt/ [1] https://github.com/jjgomera/pychemqt https://github.com/jjgomera/pychemqt