The project is abandoned?

[Signorini]

The project is abandoned? Last commit is june 2018, like 1 year.

[rebyn]

The company behind this (Operable) disbanded at least 2 years ago. Cog is still used in the wild, but maintenance & feature development are largely carried out in silos by developers who used it from the very beginning.

[jmhostalet]

which the best alternative ?

[simon1tan]

https://github.com/getgort/gort