[pja]

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.

[Zababa]

Shellcheck is the other one. I'm not aware of any others.

[throwaway81523]

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.

[hnzix]

In cryptoland, Cardano is built on Haskell. This does create a barrier to entry compared to say a Javascript-esque language.