I know also about BitTorrent Token which can be earned for free just downloading, you will automatically earn BitTorrent (BTT) by seeding those downloads.
I've read some reviews of this method of earning and it is not as easy as might be. You cant just download a torrent and left it seeding and earn. To be able to earn you need to download all the time new torrents, delete what you have download and download new. Minimum withdrawal amount is 1000 BTT.
A guy downloaded about 100Gb in one day and left it seeding and earned about 3.5 BTT ~ $0.001. I did not checked this information, nor I have tried to earn with that method. But if the numbers are true, it is not worth spending time.