GHCup is a Haskell toolset installer and version management tool. It's similar to RVM for Ruby, NVM for Node, or SDKMAN for Java.
The playground allows you to experiment with Haskell in browser without installing it locally. It allows embedding runnable code examples into tutorials and documentation.
Official extension for VSCode.
Plugin for IDEs based on IntelliJ Platform.
Haskell mode for GNU Emacs.
Use Haskell Language Server with VIM or Neovim.