Here's a "boring" haskell app: https://dill.network/ It's a vegan product scanner. You can find the story behind the project here: https://twitter.com/larsparsfromage/status/13211859357117358...

Here's a "boring" internal management system: https://twitter.com/fegundersen/status/1325534608079941633

Disclaimer: Founder of digitally induced, the company that helps make boring things with IHP+Haskell :)