It's more than that, it's a whole engine and launcher combo for (mostly) voxel games, most of which again are Minecraft like, but some are very different. It's made some huge leaps recently, graphics wise and functionality wise. The promise of the engine is also being fulfilled with more original game projects being developed for it.
I was gonna ask for a link but the post itself is the link. Gonna try it now.
Minecraft-like? So does it have all Minecraft basic stuff? Day/night, basic mods, tools, etc? I mean, can you do what Minecraft 1.7.10 can do (more or less)?