According to your interest in this term, we suppose you already have an Ethereum wallet address.
Claymore has created a miner that allows users to mine both Ethereum and another cryptocurrency like Decred/Siacoin/Lbry/Pascal at the same time without losing too much efficiency, allowing you to not lose much of the Ethereum hashrate while mining a different coin at the same time.
This miner has a built-in fee of 1% but the optimization surpasses said fee by far, making this the most efficient Ethereum miner out there. This miner works both with pool and solo modes and even allows for dual mining.
Decred/Siacoin/Lbry/Pascal is mined without a developer fee.