Once an hour you can "roll" to get free BTC. You can then play MULTIPLY BTC (like an over/under game) or buy lottery tickets to increase your free Bitcoin rewards at https://freebitco.in/?r=10492954 . It's not a lot but it is legit.
You can also earn 4.08% interest on any BTC held there. You can argue you could get better returns in other ways but this is totally passive. All you need to do is maintain a balance of at least 30,000 satoshi (0.0003 BTC – which you can earn free on the site) in your FreeBitco.in account and they pay you compounded interest on your full balance every day. There is no lock-in period to earn interest and your balance can be withdrawn any time.
If nothing else the over/under game is fun and you don't even have to do anything to get BTC to play; just use what they give you.
Check it out: https://freebitco.in/?r=10492954