Prime Pools are currently under BETA Testing. They have, for now, Electroneum (ETN) Pool in Active BETA Testing and more pools coming soon with a PPLNS system. With servers based on the U.S.A, they are improving the back-end of the Pools.
EPool is a multi-currency pool that allows users to mine through a PPLNS or SOLO payment system. Epool was Ethereum Classic's very first large pool and reached 260GH and over 1000 miners within the first week. 50% of the pool fees donated to ETC Development Fund
TheCoin is a multi-cryptocurrency pool. It allows users to mine multiple cryptocurrencies: ACOIN, ASC, CNC, CSC, DGB, DGC, NOTE, FST, FFC, FLO, FRK, GLD, XJO, MEC, MYR, SXC, SWING, TGC, TIT, UNIT, XVG, WBB, and ZET. All these coins can be mined for a 0% fee, as the pool runs on donations. The payment system for TheCoin is Prop.