I opened Brow6el as a joke. Ten minutes later, I was wondering why it worked so well.

A fork of fsharp/vim-fsharp. Uses LSP-mode of FsAutoComplete as a backend. Uses one of the following LSP clients: Neovim's built-in LSP client (requires Neovim 0.5+) autozimu/LanguageClient-neovim.

Zepl is a lightweight, simple and easy to use REPL integration package for Vim 8.1+ and Neovim. It provides a small set of key bindings and commands to start and interact with a running REPL.