If anyone here is interested, I'm developing a spiritual/technical successor to Subspace. It's slow but steady progress, but you can learn more and catch up on the latest here:

YouTube List: https://www.youtube.com/playlist?lis...TSqlaZnjKfpT5O
Discord: https://discord.gg/98quz76
GitHub: https://github.com/assofohdz/Subspace-Infinity

Contributions/collaboration is most welcome. Intention is to keep it opensource. To put a few words on the development: It's based on jMonkeyEngine (java 3d game engine), a pure entity system (zay-es), a highly efficient object synchronization library (sim-ethereal), and an authoritative server/client setup.