Janeway is a free, open source publishing platform developed by the Centre for Technology and Publishing at Birkbeck to support the Open Library of Humanities' goals.
Written in Django/Python from the ground up and still under active development, the software includes a submission system, a peer-review management workflow, Crossref DOI integration, OAI feeds, Open Journal Systems import mechanisms, an extensible plugin architecture, and much more.
Janeway is licensed under the AGPL meaning that anyone is free to use and modify the software, so long as they make their changes similarly open (even if they modify the code in private and publicly host that instance). The software is lightweight and can run on shared hosting platforms that support WSGI, such as Reclaim Hosting.
For more information, see Martin Paul Eve and Andy Byers, ‘Janeway: A Scholarly Communications Platform’, UKSG Insights, 31: 15, 1–4 (2018) <https://doi.org/10.1629/uksg.396>