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Gridcoin offers rewards for donating your computer power to solving world issues such as cancer research, climate prediction, malaria control and even search for aliens! A full list of the amazing projects that reward GridCoin cryptocurrency are listed here: https://www.gridcoin.us/Guides/whitelist.htm. I would highly recommend GridCoin because it has a highly stable and supportive community. The contributors believe in not just making money but helping the planet. Optionally, you can just leave your wallet online to earn a 1.5% APY.
For the full review go here:
https://altcoinandme.com/gridcoin-cryptocurrency/