The graphics mod that makes Muria work
Lua libraries for use by other mods and submods that are parts of a larger mod.
New places to build more factories.
Augmented or new ways of transporting materials - belts, inserters, pipes!
New ways to deal with enemies, be it attack or defense.
Map generation and terrain modification.
New Ores and resources as well as machines.
Things related to oil and other fluids.
Furnaces, assembling machines, production chains.