Look into Vechain Thor, it's also going to provide passive income in the form of Thor, one of the biggest investors that i know has invested and is very bullish on it Jim Breyer, Vechain has connections to some of the biggest companies in the world like PwC, Dnv, etc... it's already being used in some companies and others are going to use it, the concept is amazing and the mainnet launch is happening atm, already launched but the tokens still need to migrate, etc...! I just wish i had more money to put into it tbh.

I'm also a big believer in passive income, in cryptos my main passive income coins are STEEM, EOS, VeChain, Steelar(1% inflation every year), i'm trying to increase my Vechain atm and after it i'll either go for NEO or get 1000 SmartCash (it's very cheap atm).