Gany's End is compatible with pretty much any other mod.
But for a few mods there's even more!
Thaumcraft 4[]
All the items have aspects
Cooking Raw Endium on the Infernal Furnace will give you extra nuggets
Gany's Nether[]
Cooking Raw Endium on the Magmatic Centrifuge will give you a bonus nugget
Tinker's Construct[]
Make tools out of endium! A tinker tool that is built with any endium part can be right-clicked an in inventory to bound to it. Once the tool is bound to an inventory, drops from blocks mined or entities killed with that tool, will go straight into that inventory instead of dropping onto the ground! Make yourself an endium hammer and go mining, and you'll never have inventory problems :D