User blog comment:AlteOgre/Medieval-fantasy themed multiplayer worlds in other voxel based open world games/@comment-25330335-20180511143315

If the LOTR mod were to be rewritten, I would reccomend using an open-source game like Terasology. Open source games are in my mind less likely to die off and easier to develop for, because often they are much happier to have modders building content and are often willing to add functionality to the engine to make modding easier. It's also easier to understand what your mod does if you can read the source for calls you're making.

Terasology really is a gem though, looks great. Takes a little getting used to though.