TO BE HONEST there is two, not including bitcoin
Nxt
Etherum
Choose Nxt, you get a full decentralized platform, first to be a 2.0, and its already out and testing. also you can create content on top of nxt if you know how to code.
https://www.youtube.com/watch?v=xzbNDCoHn60http://nxtra.org/nxt-client/index.html userfriendly webclient in testmode, you can play around and can get free testcoins to try, just ask for it in the forums.
https://nxtforum.org/ nxt forum
Choose Etherum, you get a half centralized/half decentralized platform, a true competitor with nxt, and still under developement.
OR wait for bitcoin 2.0, half centralized/half decentralized with multi parallel chains(which nxt already has as well and working), until bitcoins are fully mined, only then it can be considered full decentralized. bitcoin 2.0 is basically trying to do what nxt and etherum are doing already.