JetBrains Rider (C#) - Syntax highlighting, autocompletion and run configurations.

lang-gdscript

Gd script godot scripting language grammar and completions for atom io

Emacs - Syntax highlighting, code folding, indentation and autocompletion.

Geany - Syntax highlighting.

Gedit - Syntax highlighting.

IntelliJ IDEA - Syntax highlighting and autocompletion.

Kakoune - Syntax highlighting.

GNU Nano - Syntax highlighting.

Sublime Text - Syntax highlighting.

Vim - Syntax highlighting, autocompletion and linting using the LSP server provided by the Godot editor. Also supports the Godot shader language.

Visual Studio

godot-tools - Visual Studio Marketplace

Extension for visual studio code tools for game development with godot game engine

C# Tools for Godot - Visual Studio Marketplace

Extension for visual studio code debugger and utilities for working with godot c projects

GUT Visual Studio Code Extension - Run GUT framework unit/integration tests directly from the Visual Studio Code Editors.

GDScript Formatter - Visual Studio Marketplace

Extension for visual studio code formatter for gd script in visual studio code using scony s gd script toolkit