Litecoinpool was first created in 2011 and is a LTC mining pool with no fees. it allows users to mine Litecoin while smart merge mining 7 other cryptocurrencies that are automatically converted to Litecoin.
The Onion Pool is an Ether mining pool that currently charges no fee. It runs on a prop payment system and rewards miners with the block tx. fees as well. The minimum payout is 0.01 ETH.