Ex Nihilo was designed to allow Skyblock maps to be played with mods. As such, when certain other mods are installed, it adds additional features to itself. If multiple mods are active that would add the same features, the features are not duplicated.
The Sieve can produce Copper, Tin, and Apatite.
The Sieve can produce Copper, Tin, Lead, Silver, Nickel (Ferrous), and Platinum (Shiny).
Ex Nihilo Ore Gravels, Sands, and Dusts can be placed in a Pulverizer as if they were ore blocks.
The Sieve can produce Silver and Lead.
The Sieve can produce Osmium.
The Sieve can produce Copper, Tin, and Aluminum.
Ex Nihilo Ore Gravels, Sands, and Dusts can be melted in a Smeltery as if they were ore blocks.
If both IndustrialCraft 2 and MineFactory Reloaded are installed, Rubber Tree Seeds will randomly choose which mod's sapling to create.
Ex Nihilo has two add-on mods, Ex Aliquo and Ex Astris. Each of them add additional features for additional mods.