I am already on freebitcoin xD... I also advertised it on steemit.. sadly got no referals xD. Anyways goodluck on your quest, and no I dont really know about other referal faucets... although on Google Play Store you can check out these faucets

XVGFaucet .... Verge (XVG) withdrawal payout 200coins

ETNFaucet .... Electroneum (ETN) withdrawal payout 200 coins

Binance Reward System .... Binance coin (BNB) withdrawal payout 10 coins

They are all from the same developers I think... im not sure if they pay, because the payout is a bit high but its reachable... and if it pays out itll payout quite alot... have to mention it does look really legit