My biggest problem with pure FP languages is a lack of interesting projects - anyone have a good one that isn't a parser?

https://github.com/facebook/Haxl - A Haskell library that simplifies access to remote data, such as databases or web-based services.

https://github.com/koalaman/shellcheck - ShellCheck, a static analysis tool for shell scripts

https://github.com/simonmichael/hledger - The hledger command-line and web-based accounting tool, a Haskell rewrite of ledger.

https://github.com/facebook/flow - Adds static typing to JavaScript to improve developer productivity and code quality.

https://github.com/coq/coq - Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.