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Re:Three Months of Go, from a Haskeller’s perspective (2016) by zumu on Sunday March 19, 2017 @03:11PM (#13909011)
Not OSS, but I know Galois use a lot of haskell in their work for largely government agencies (NASA, DoD, etc.)

Perhaps the type of problems Haskell is apt to solve (those requiring strict correctness, etc.) are not typically open source software projects.

Re:Three Months of Go, from a Haskeller’s perspective (2016) by Ar-Curunir on Sunday March 19, 2017 @03:37PM (#13909166)
Maybe not Haskell, but a lot of ideas from Haskell and Haskell-like languages such as typeclasses, Option types, type inference, etc. have found their way to Rust, and it makes programming in Rust an absolute pleasure.

Rust, I'd argue, is the correct choice for many OSS projects. In fact, for security-focused projects, it should be the only choice. C-like performance without C-like vulnerabilities? It makes no sense to choose C or C++ any more.