We need to create a master list of cryptos that provide a yield. I think Dash would qualify. I haven't looked into it so much, but if you run a masternode then you receive part of the block reward. The same will be true of Zen, if it isn't already, for running a secure node. Polkadot will also provide a yield once it is built.
As I type this out I realised that someone on Steemit has already started a list: https://steemit.com/cryptocurrency/@mnemonic19/masternodes-in-cryptocurrency
RE: Earning Passive Income in Cryptocurrency