Survey Monkey with Lightning Payments per question. Incentivize people to take your damn survey. It's a cool demo project because it's a "faucet" where you give people sats looking at the demo instead of building a hypothetical ecommerce site that charges sats, which nobody will actually do.

Notarize-the-dms: a chat app where you can toggle a PGP signature on your dms to verify those screenshots are indeed legit (not photoshopped). For example, for a conversation between you and your landlord.