 haskell-websockets is a library for writing WebSocket-capable servers in Haskell. It provides a low-level API for working with WebSockets directly, as well as a high-level API for dealing with WebSocket connections in a more organized and sensible way. The library is designed to be easy to use, with a clean and simple API that is easy to understand and work with. In addition, it includes various features such as automated connection handling, data serialization and deserialization, and more. Overall, haskell-websockets is a great choice for anyone looking to write WebSocket-capable servers in Haskell.  