Well, there are ways but I have not tried any of them and dont want to mislead any new users. Still they are not ponzi schemes.
- Andriod game, pays out in Bitcoin
a.Bicoinpopper
b.blockchaingame - Take surveys, complete micro tasks
bitcoinget.com - Watching advertisements
Link to the site
Let me know, if you came across any other ways, I will surely take a note of it. But since they are free, they might come with a risk also - Just a note of caution.