Here is a small list of currently supported extensions, widgets and apps provided by the rAthena Dev Team.
Visual Studio Code
rAthena Language Support
Visual Studio Marketplace | GitHub
This extension adds syntax highlighting to NPC scripts. Select "rAthena" via the Language Mode selector in the bottom right corner of the editor to enable it, or save your NPC scripts with the .rascript extension for automatic detection.
This extension was initially ported from JoWei's language-athena for Atom editor and published via VS Marketplace by secretdataz, a member of the rAthena Dev Team. The repository was then archived and is no longer maintained. This extension is now maintained by the rAthena Dev Team.