Complete Angel's and Bob's Space Age integration with extra planets: Planetaris-arig, Planetaris-hyarion, Paracelsin, Maraxsis and Moon of Nauvis Muluna.
Large total conversion mods.
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!
Trains are great, but what if they could do even more?
New ways to deal with enemies, be it attack or defense.
Armors or armor equipment.
Changes to the player's in-game appearance.
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.
Entities which interact with the circuit network.
Furnaces, assembling machines, production chains.
Changes to power production and distribution.
More than just chests.
Perhaps remove Maraxis dependency, as notnotmelon deprecated it?
