take a look at passopolis[0], a fork of Mitro[1] - which got acquihired by Twitter and later stopped supporting the project. You can either use the free hosted

take a look at passopolis[0], a fork of Mitro[1] - which got acquihired by Twitter and later stopped supporting the project. You can either use the free hosted service by passopolis, or host your own. disclaimer: not affiliated with either of those, but was a happy Mitro user and then switched to Passopolis (and am still very happy to use and know the project lives on). [0] https://passopolis.com https://passopolis.com / https://github.com/WeAreWizards/passopolis-server https://github.com/WeAreWizards/passopolis-server [1] https://www.mitro.co/ https://www.mitro.co/ (certificate expired)