There are one or two Haskell applications you might touch in real world use without realising that they’re written in Haskell. Pandoc is the obvious one.
Shellcheck is the other one. I'm not aware of any others.
In cryptoland, Cardano is built on Haskell. This does create a barrier to entry compared to say a Javascript-esque language.
I use Gitit sometimes. Also don't forget Perl 6 has some origins in Haskell. I.e., Pugs influenced the final language quite a bit though Pugs itself is no longer in use.