Real World Haskell [ Best Pick ]

What are the best real world applications developed with Haskell?

Haskell is utilized in several high-profile tools and industries where correctness and performance are critical: Real World Haskell

: Haskell makes a strict distinction between "pure" code—functions that always return the same output for the same input—and code that performs side effects (like writing to a file). This separation, managed via the IO Monad , makes programs easier to test and reason about. What are the best real world applications developed