I did the coinhive pool, where you can mine monero with coinhive (in browser) and receive rewards in altcoins.
Main difference between my project and other projects with coinhive are lower payout fees and withdraw amounts. You can claim any amount above payout fee. Sample: for dogecoin payout fee is 1 DOGE. You can mine 1.01 DOGE, and receive 0.01 DOGE.
Current altcoin list: banano, bitcoin, burstcoin, digibyte, dogecoin electroneum, gas, byteball, gridcoin, garlicoin, litecoin, nano, reddcoin, tron, stellar, monero, ripple.
Currently withdraws takes up to 24 hours, except for burstcoin and gridcoin. They are withdrawing in 30 minutes. I'm working on automatisation.
Also I could add any coin you want. But there is some requirements:
Coin should have exchange rate somewhere, and bid/ask should not be very different
Payout fee should not be very big on exchange
Somebody should withdraw that coin at least mounthly
Pool itself https://hivepool.arikado.ru/
Steemit post with more instructions and details - link