Python Power Electronics is a free and open source circuit simulator for power engineering applications and is available as a web based application and a command line application. The web based application requires the installation of a Django based server following which the simulation can be run from a web browser which makes simulation easier and is therefore the recommended approach. The command line application involves execution of Python commands in a command line and is recommended for advanced users.
Prefer to use Git and pull code from a repository? Check out the Bitbucket repo.