SteemDollars you can stake in your web wallet here on SteemIt and get interest 10% (I'm putting everything to SteemPower, so I don't have personal experience). With SteemPower you can use some automated services to upvote for you to basically have passive income (despite the fact it is not technically staking).
BitShares are using DPoS - more on that you can read here http://cryptorials.io/glossary/delegated-proof-of-stake/
RE: Passive income from cryptos and getting free coins by holding Bitcoin