SophiaTX (SPHTX) is the cryptocurrency developed by the eponymous platform and marketplace established in 2017. Originally being an ERC20 token, SPHTX underwent a swap to its own mainnet released in mid-2018.
Sebastian Schepis, the Syscoin founder, built Syscoin 1.0 as a blockchain-based marketplace for buying and selling goods. In its third edition in 2018 it became a fully developed blockchain platform. In 2019, Syscoin 4.0 enables any ERC20 to integrate with its Bitcoin-compliant system to accomplish ultra speed and security.
The Dentacoin (DCN) token represents an extended version of an ERC-20 contract. The token is available with several exchange platforms. At the moment of writing, you can trade DCN against two fiat currencies (EUR and USD) with Folgory exchange.