Stealthcoin (XST) has been rebranded to Stealth (XST): https://twitter.com/stealthsend/status/993226001101545473 Stealthcoin provides a complete anonymity solution for cryptocurrencies. Stealthcoin has a fair distribution with nearly four hours of low block rewards, a small premine of 1%, and the long-term energy efficiency of proof-of-stake minting.
Ren is an open protocol that enables the permissionless and private transfer of value between any blockchain. Ren's core product, RenVM, is focused on bringing interoperability to decentralized finance (DeFi). Ren was founded in 2017 and is headquartered in Singapore.