I had 2 winning projects from the Chainlink Fall 2021 Hackathon.
WeiGold [servo motor controlled vending machine for buying commodities at spot price with Chainlink pricefeeds]: https://devpost.com/software/testname-znx82s
Disruptive Insurance [volcano insurance using Chainlink API requests to get volcano eruption data]: https://devpost.com/software/insuredisruption