oTree Manager is a software package initially written by Christian König gen. Kersting and published under the MIT License. Its source code is available on GitHub and the documentation can be found hat http://docs.otree-manager.com.
If oTree Manager made running experiments easier for you, please consider citing the accompanying paper when publishing your results:
König-Kersting, C. (2019). oTree Manager: Multi-user oTree installations made easy. Working Paper.