A group of planets still orbiting their dead star.
Mods introducing new content into the game.
New places to build more factories.
Transportation of the player, be it vehicles or teleporters.
Augmented or new ways of transporting materials - belts, inserters, pipes!
New ways to deal with enemies, be it attack or defense.
Armors or armor equipment.
Changes to enemies or entirely new enemies to deal with.
Map generation and terrain modification.
New Ores and resources as well as machines.
Things related to oil and other fluids.
Related to roboports and logistic robots.
Furnaces, assembling machines, production chains.
Changes to power production and distribution.
Got this after downloading mod and apply to others
"Error while running setup for entity prototype "gas-collector-roboport" (roboport): next_upgrade can't be set when flag 'not-upgradable' is set."
Not my bug, if a roboport mod that is trying to upgrade things that are explicitly marked as excluded for it then I can't do anything. I did what I can to protect against this issue, if it is not respected then I can't help it.