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.
Ubiq is a decentralized platform which allows the creation and implementation of smart contracts and decentralized applications. Built upon an improved Ethereum codebase, the Ubiq blockchain acts as a large globally distributed ledger and supercomputer, allowing developers to create decentralized and automated solutions to thousands of tasks which today are carried out by third party intermediaries.