Small list cool Bitcoin/lightning projects:

https://satoshis.place/ - write pixels, pay with satoshis
https://lnmarkets.com/ - lightning trading
https://www.twitch.tv/tanglesheep (https://www.tanglesheep.com) - feed sheep
https://seedsigner.com/ - DIY bitcoin seed signer (Future of HW wallets?)

...please add if you know more projects like these