Who says development is dead. Please check the changelog.

https://kallithea-scm.org/repos/kallithea/changelog

Now lets look at Rhodecode. https://code.rhodecode.com/rhodecode-enterprise-ce

You will notice that Kallithea has been consistently updated regularly. Besides user like me its also used internally at Unity Engine.

Also the features you mentioned not all are in Rhodecode open source edition.

I'm not really following the "commits" but rather following releases. In the last 2 Years Kallithea had only 1 minor release (https://pypi.org/project/Kallithea/#history) 0.3 -> 0.4 without many new features. RhodeCode had 5 minor releases (https://docs.rhodecode.com/RhodeCode-Enterprise/release-note...) and multiple bugfix releases. I'm aware not all features in comparison are free, but we use the CE free version and it's enough for us at this point.

Actually 0.3 to 0.4.1 is a major release with many changes including new mercurial versions and better git support with updated UI and celery for background tasks. If you see a new ssh feature is just added with documentation.

Kallithea is pretty easy to work with and extend. We recently updated and built a CI using buildbot. Rhodecode and Kallithea have diverged enough and are moving differently. Also its a Software freedom conservancy project so it will be supported, hopefully it can attract bit larger community.

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

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.