RigPool is a Bitcoin mining pool that pays miners through a PPLNS payment system. The pool has a 0% fee and the minimum payout is made when the user reaches 0.001 BTC.
Although NiceHash is usually regarded as a mining service, it's better to say that it's a kind of a platform for selling/buying cloud mining contracts. What is special about NiceHash is that users can opt for both selling and buying the hash power on this platform.
DutchMining is an Ether mining pool in Europe where users can mine ETH for a 0.25% fee and through a Prop payment system. The pool always shares the transaction fees with miners and processes payments at a minimum 0.2 ETH threshold.
FlyHodler is a cloud mining services provider. With HODL contracts, the users can withdraw all its initial investment, plus mining income. It works as a bank deposit, so the users can top-up and withdraw their deposits, and their hashrate changes accordingly.