Superpowers
From Game Making Tools Wiki
Superpowers is an open-source game making tool, with lots of export options (I think via Electron though?), and lots of nice built-in things like physics, online play, and real-time online collaboration.
Developments pretty slow at this point in time.
Links
- Homepage
- Superpowers on Itch.io
- sparklinlabs.com - Developers
- github.com/superpowers