IQMining is an online cloud mining service that offers to remotely mine Bitcoin cryptocurrencies (SHA-256 algorithm), Litecoin (Scrypt), Ethereum (Ethash) and other altcoins without the need to buy equipment.
BTCSweet is a UK based cloud mining company launched in 2017.
BTCSweet charges no maintenance fee. The contracts are "lifetime" (it means that there is no determined duration of the contract and it finishes when the chosen mining plan becomes unprofitable). The platform accepts payments in Bitcoin, or by Payeer, Perfect Money or PayPal.
HydroMiner is a cryptocurrency mining company using green energy drawn from hydro power stations in the Alpine region of Europe. Hydro-power is generally thought to be one of the most effective and lowest-cost renewable energy resources. It is environmentally friendly, carbon-neutral and natural.