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It has been through a long, long overhaul towards the 2.0 version. I guess it's a fine engine, but rendering API have evolved a lot and I don't know if ogre3d is still relevant today... Its founder left some years ago...

They rewrote it a lot. However Ogre3D is just a rendering framework, not a full game engine.

There's Urho3D (https://urho3d.github.io) which seems to be mostly a clone of OGRE. I don't know if any of the same people work on it.

Xamarin have a C# wrapper for it, UrhoSharp (https://developer.xamarin.com/guides/cross-platform/urho/). I'm working with it now and I like it a lot better than Unity so far; but I strongly prefer to work in code rather than doing everything in Unity's IDE.

Urho is so much much more than Ogre3D and it's definitely not a clone of Ogre3D. It's full game engine with a lot of features - audio, physics, navigation, ... while Ogre is basically just rendering library. And Urho's rendering is not closer to Ogre than any other rendering solution out there. The only thing they seem to have in common is that people are slowly losing interest in them, which is unfortunate.

OGRE is a rendering engine not a game engine. You still have to add networking, physics, sound and other features like that to create a game.