[deepnet]

Is there a good GPLed substitute for Minecraft ?

I am required to use a Free license as an educator and the massive appeal of voxels is undisputable.

[KON_Air]

http://www.minetest.net/ (LGPL)

http://manicdigger.github.io/ (Unlicense)

I am pretty sure there are more out there and as far as I know minetest is closest to minecraft with this mod for for redstone circuitry thing (https://forum.minetest.net/viewtopic.php?f=11&t=628).

[deepnet]

Thanks this is very useful.