As of now, Quantum Resistant Ledger (QRL) coin is represented on a few exchanges paired against BTC. Originally being an ERC-20 token, it switched to its own mainnet in 2018. The QRL claims to be the first decentralized cryptocurrency, that is resistant to both classical and quantum computing attacks.
Bitcoin SV is a Bitcoin Cash hard fork that took place in 2018 as an alternative to Bitcoin Cash ABC. One of the core developers of Bitcoin SV Craig Wright believes that Bitcoin SV is much closer to the initial idea of Bitcoin than Bitcoin Cash ABC. The dev team of Bitcoin SV is focused on fast transactions. Their goal is creating use case opportunities for Bitcoin.
Bitcoin SV survived a series of delistings from several notable cryptocurrency exchanges and managed to keep its high position on the market. Bitcoin SV is one of the top 10 cryptocurrencies by market capitalization and its daily trade volume is similar to its rival Bitcoin Cash ABC.
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.