Windhawk aims to make it easier to customize Windows programs. It allows installing and configuring mods (customization modules) with just a couple of clicks. For developers, it provides a convenient platform for developing and sharing such mods. Check out the introduction blog post for more details:
https://ramensoftware.com/windhawk
I'm using VSCodium not only for the labels and buttons, but also for its code editing capabilities. In development mode, you get features such as code navigation and code completion. My rational is the following: storage is cheap, and the resource usage is only relevant when the UI is shown. The tray icon and the background service are implemented in C++ and are very lightweight.