Horizen (ZEN) is the native cryptocurrency of Horizen blockchain. It can be mined. Much alike Zcash, ZEN offers regular and shielded addresses. A number of exchanges feature ZEN, including USD as a pairing choice on Bittrex.
Arcblock (ABT) token is currently based on cryptocurrency Ethereum protocol. It is a pre-mined utility token used to pay expenses within the ArcBlock ecosystem. At the moment, ABT is listed on a number of exchanges with the possibility to trade it against fiat (KRW on the Bithumb exchange).