Attention: Linux only
Mod that kill and restart server if server is hanged for some mods.
Still buggy, strangely kills the server if there's low activity, i don't know if Minetest stops to run lua when no player are playing.
The mod itself is just a timetracker that writes a timestamp in /tmp, the script is the one that checks, should be used as launcher.
Highly experimental and unstable. Uses bash and date.
License: WTFPL
Edit 2015-06-19: updated version 1.1 here