StupiCraft

Steel can be made from iron ingots and coke, and the process also yields carbon from smelting coal. Red Iron is a special material produced by smoking iron with coke and then combining it with more coke. Steel and Red Steel tools are provided, with steel-type equivalents that are slightly better than iron and Red Steel rebalanced to match.

Obsidian is worked into Chipped Obsidian by bottling the tears of crying obsidian, then into Obsidian Shards and Obsidian Ingots, which suit items that must tolerate high heat. Steel Fibers form a mesh fabric for strong applications that need to bend. Obsidian Bricks give a dark brick block for building, and a Steel-Obsidian Mold, lined with steel, is used to melt and form the special materials. A simple plating tool using tungsten is also included.

The mod is an open-ended project whose stated goal is to raise the mid- and late-game complexity over time. Many recipes can be automated, so players who use crafters can build automated lines around them. It runs on client and server and is published for NeoForge only, for 1.21.1 – 1.21.10. Its license is Creative Commons Attribution Non Commercial Share Alike 4.0, so the code is not open source.