The game engine behind Spectromancer and Astral Heroes games is made open source and published at GitHub: https://github.com/Cooler2/ApusGameEngine
I've also published source code of some demo projects including Astral Heroes website, game backup/analytics tool, game auto-updater. They're available at the GitHub too: https://github.com/Cooler2/ApusEngineExamples
This became possible because of support I've got at Patreon. Now we're very close to the second goal: the source code of the Astral Heroes game server will be published. You're welcome to support this development - just become a patron to make this happen: https://www.patreon.com/ApusGameEngine