As @mschmidt suggested here: Fusion Atom language I think it would be a good idea to gather all existing Editor/Development Plugins for Neos and Flow development.
I created this post in the Newcomers Corner because the question of available tooling is most likely asked by newcomers.
Maybe we can make this thread sticky.
Feel free to add all tools you know or change the structure of this list 
Editortools
Atom:
Fusion-Plugin: https://atom.io/packages/language-typoscript2
VisualStudio-Code:
Fusion-Plugin: https://marketplace.visualstudio.com/items?itemName=networkteam.neos-fusion
PHPStorm:
IDE-Features: https://plugins.jetbrains.com/plugin/9362-neos-support
Shelltools
ZSH:
Auto-Completion: https://github.com/sandstorm/oh-my-zsh-flow-plugin