If your mod has a feature, Factorization had it first.
I forgot…
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Rule #1 applies to (among other things)
BuildCraft
any mod that adds barrels or barrel-like blocks
any mod that adds pocket crafting
any mod that adds ore tripling (not sure about this one)
any mod adding lamps that light up an area larger than 15 blocks
any mod turning food into energy
Botania