This is an early release of an extension that adds support for ZIL to Visual Studio Code, Microsoft’s open-source IDE for Windows, Mac, and Linux. Besides syntax highlighting, this also adds various IntelliSense features to assist with writing code, and a debugger to step through the compiled game, set breakpoints, and inspect variables.
The debugger is built on ZLR, and could potentially be extended to support Inform Z-code games as well.
To install it, just run VS Code and search for “ZIL” in the extension tab.
(More screenshots over here.)