Got a github link https://github.com/lumen/ but it seems abandoned and not actively maintained
https://getfirefly.org/
https://github.com/GetFirefly/firefly#about-firefly
Firefly is the new name, Lumen the old. Lumen lost momentum for a bit, DockYard seems recommitted to finishing it up.
I think it has fantastic promise.
Source: was helping publish news back when