Ethereum Classic appeared after Ethereum hard fork in 2016. Just like Ethereum, the platform is capable of hosting smart contracts and serves as a virtual computing machine. The native token of Ethereum Classic is ether (ETC).
THEKEY (TKY) is the token of the Chinese government endorsed blockchain based identity verification ecosystem. The token is currently based on cryptocurrency NEO protocol. It is listed on a few exchanges paired against major crypto coins.
Qtum (QTUM) is an opensource blockchain platform launched by the Singapore-based team of developers in 2017. The project provides an opportunity to maintain the connection between the virtual machines and the blockchain. Also, Qtum users can create smart contracts and build DApps with the help of the platform. It is important to mention that Qtum is compatible with DApps built on other blockchains.