NXT is one of the early cryptocurrencies and was started in 2013. As the Jelurida project’s website states, it was the “first to rely entirely on the PoS protocol”. It is currently listed by the number of exchanges.
Mixin (XIN) is an ERC-20 compliant utility token of the open Mixin messaging platform that serves for easy transfers of crypto. The token is available with a few exchanges.
Being originally based on the Ethereum blockchain, the Enigma (ENG) token has moved to the network’s own mainnet in 2019. As an ERC-20 token, it still can be traded on a number of exchanges against major crypto coins.