Included

Incorporated into FU

 * Frackin' Races
 * Augment Extractor
 * Bees!
 * Dungeoneer Dungeons
 * Extra Dungeons
 * Harvester Beamgun
 * Kirhos
 * Legacy Dungeons
 * Legacy Monsters
 * Mantizi Race
 * Mech Overhaul
 * Memento Mori
 * Nightar
 * Peglaci
 * Prop Pack
 * Skath
 * Slime Race Mod
 * Starbooze
 * ztarbound
 * Pandora's Box (partially)
 * Racial Shop Counters
 * Foodie's Furnitures
 * XCustomCodex
 * Automation Aides
 * Classical Weaponry (partially)
 * Terrain Tweaks

Already in FU, or at least similar to it

 * Aimable Shields - FU already has it. It wont affect all modded shields though. Still, installing it or a mod similar to it is risky as it may cause bugs.
 * Any race extender - FU already has it, and quite big at that. Do NOT install another race extender unless its PROVEN to be compatible with FU.
 * Any mod that allows you to build your own ship - FU already has this. No matter what, do not install another mod that does the same or similar thing.
 * Any mod that adds bonuses and traits to vanilla and FU races - FU already has it, though any mod that adds a status effect buff as a 'race trait/bonus' should still be safely compatible, for example this mod or this should still work. Additionally, you can disable FU racial bonuses in SAIL
 * Any mod that add machines that collect, extract, or generate resources - FU has such machines; pumps, quarries, extractors, sifters, rock crushers, and centrifuges. It should still be fine to install another one, as long as its completely independent from FU, because modifying FU's machines is risky.
 * Field Generator - FU has it. If you still insist on installing that mod or similar one, go ahead. As long as it doesn't modify FU's Field Generator and is completely independent, there shouldn't be any issues (Already TESTED).
 * Any mod that allows you to play as Fenerox - FU already made it playable. See this page.
 * Any mod that allows you to play as Shadow AKA those black NPCs you encounter in Midnight planets and biomes - FU already made it playable. See this page.
 * Underground Spider Nest - If the spider silk is all you want, you can also find lots of it in our own Underground Spider Nest or this. Other than that, there should be no issues installing that mod, except that our spider monsters like this one will not spawn there.
 * Mods that allow you to collect more rock types like this or this - FU does this already. There's simply no point installing it.

Installing mods that are already included (even if only partially) can either have no effect, have duplicate items and interactions, or make the game unstable. You may also want to check out a list of incompatible mods. Frackin' Universe makes its own changes to some of the included mods, which is even more reason not to install included mods.