winMenu
Quick links: documentation · itch.io · source code
 Platforms: Windows, Windows (YYC)
 Versions: all of them (from GameMaker 8.1 to the latest stable)
An extension for using menus in GM games! That includes:
- Popup/context menus
 - Menu bars
 - System menus (shown when right-clicking window caption)
 
The extension wraps almost entirety of Windows' Menu API so you can have things like
- Buttons
 - Separators
 - Checkboxes
 - Radio buttons
 - Sub-menus
 - Custom bitmaps
 - Size/position measurement and other utilities
 
The extension is fairly easy to use (make a menu, add items, show/assign menu) and thoroughly documented.
Also doing a little launch sale for the next few days