One of the few cryptocurrencies outside of Bitcoin to have any sort of long-term success is NXT. Even though this coin started out as a full Proof-of-Stake coin with no mining process involved, securing the network has proven to be relatively easy over time. Furthermore, various exchanges have shown an interest in listing NXT, and the LZF exchange is among the first ones to create a fiat currency trading pair for this alternative digital currency.
https://news.bitcoin.com/interview-nxt-foundations-dave-pearce/
