one of my favourite mods was Equivalent Exchange, but since it is OP most servers refuse to use this, and EE3 has no content at all (for me), so i searched for an alternative to it
i found a spiritual sucessor to EE called Balanced Exchange, it has the best features of EE, the transmutation, the condenser and the power of darkmatter tools in a weird way
check this Balanced Exchange mod, i think it is great