More often than not "get free cryptocurrency" means you'll lose your current ones rather than get any (aka a scam). But if you enjoy poker, there is now CoinPoker. This poker client works on the blockchain and uses it's own currency CHP. Right now there's no way to buy CHP yet. Although, you can win some by playing in 'freeroll' tournaments.

CoinPoker :

Freeroll poker tournaments that can earn you a new cryptocurrency

Don't play cash games for now: the only people who have chp are those that won tournaments, thus a much higher ratio of good players (personally experienced haha)

1 chp is supposedly €0.05, but there's no way to know for sure yet (probably worth more in the far future). Their ICO to buy chp is on the 19th of January.

If you do really well you might have a shot at playing for a brand new Tesla on January 21.

My best run thus far (2nd out of 484 players):