I haven't seen any posts about the winners from the Stellar-sponsored Hack the System hackathon by Encode so here it is!
API Hack Winner $1k XLM - Nexus Wallet
A wallet utilizing SEP-24 for withdrawal/deposits of stablecoins for cross-border payments and remittance
(couldn't find a link if anyone has it let me know)
Educational Hack Winner $2k XLM - StellarRed & CryptoCannoneer
A "low-code" programming interface utilizing node red for making building on Stellar easier for non-coders. Plus an interactive livestream shooting gallery game utilizing the StellarRed SDK that allows players to fire tennis balls at targets and literally burn crypto via flamethrowers! (open source)
Entrepreneurial Hack Winner $3k XLM - Freia Pay
An NFC based PoS utilizing path payment for cross asset payments