Spoilage solution - Mod that adds ways to avoid spoil! 1 - Canning! 2 - Cryogenic freezing! They will allow you to keep freshness for a long time!
Small changes concerning balance, gameplay, or graphics.
Augmented or new ways of transporting materials - belts, inserters, pipes!
Things related to oil and other fluids.
Furnaces, assembling machines, production chains.