Full List of Mods that I added some special Compatibility Stuff to:

Et Futurum (that Mod adds some 1.8+ content to 1.7.10)
Buildcraft
Railcraft
Forestry
Binnie’s Mods (requires Binnie Patcher aswell, if you use Forestry 4)
Immersive Engineering
IndustrialCraft²
IndustrialCraft² Classic (by Speiger)
Applied Energistics
Thermal Expansion
JABBA (But GT6 does replace it entirely basically)
IHL
ProjectRed
Ars Magica
Botania
Mystcraft (be careful with installing it and set "useconfigs" in the "core.cfg" at the "baselining" category to true, I had to hard-restart my Computer, because of the insane Lag it caused when it was set to false, and I have 8 GB of RAM assigned!
Thaumcraft, requires Thaumic Fixer and Baubles to work!
Forbidden Magic
Better Records
ExtraBiomesXL
Biomes o' Plenty
Highlands
Atum
The Erebus
Twilight Forest
The Betweenlands
Underground Biomes (GT Ores can generate in its Stone seemlessly)
Per Fabrica Ad Astra (all of its Ores have processing chains)
Lycanites Mobs
MoCreatures
Mariculture
MineFactory Reloaded
Mekanism
Draconic Evolution
PneumaticCraft
GalactiCraft
GalaxySpace
Advanced Rocketry
Magneticraft
Factorization
ExtraUtilities
Actually Additions
RandomThings
Ender IO
Metallurgy
Tech Guns
Open Modular Turrets
Balkon’s Weapon Mod
Pams Harvestcraft (tons of recipes were improved through my Machines)
Growthcraft Community Edition
AppleCore
Spice of Life
Enviromine (Hydration and Temperature)
RotaryCraft, ElectriCraft, ReactorCraft
All of this plus plenty of Books from several Mods that I needed to be able to place them in Shelves, and some Mods I might have forgotten.