Factorio blueprints and mods
Mods
A mod that simplifies the recipes for rocket parts, so that in the end game, your main concern is procuring a vast amount of raw materials rather than managing the factory.
Blueprints
Space saving setup of electric mining drills in various array-sizes and all belt speeds.
Right-hand rail system for five part trains.
7-segment-displays in various sizes and digit counts.
Some early- and lategame power sources.
Automatic Kovarex Enrichment Process with automatic feeding of additional machines when the first machines are running at the limit.
480 MW Nuclear Power Plant.