[marcinkuzminski]

On a side note on this. I think Unity had their own fork of Kallithea with some changes that aren't in the official version ? Or those features are backported later from the Unity release

[dragonsh]

I believe some of the unity developers are constantly creating pull request to update Kallithea and are core developers.

Can't say for sure but I think Unity's system Ono is using Kallithea as core with additional plugins developed for their own use.