Is Nuterra important?


Fancy Modder
Nuterra was a modloader for a very old version of TerraTech but the name lives on as an homage.
If you're talking about Nuterra Block Injector Library, it's an unofficial mod to add blocks but unofficial mods are getting phased out in favor of official modding and LegacyBlockLoader can replace its loading from folder behavior.
If you're talking about NuterraSteam on the Steam Workshop, it's a a port of Nuterra Block Injector Library to official modding and is needed for blocks being ported to official.