ZDoom

Graf Zahl wrote:That thing isn't bad - my main gripe is that it's using that stb_truetype library for text output which is entirely useless when having to consider localization and font substitution for missing characters (i.e. I don't think it can support Korean easily in combination with other languages.)

The DearImgui Wiki provides a simple example of loading a Truetype font with Asian-language characters and displaying a Unicode string with Japanese text, so realistically this issue probably won't crop up too much

EDIT: There's also a Freetype addon.

That thing is based on OpenGL 3.x, i.e. it has no working backend abstraction, which kills it completely.
It's also full of stupid things like outputting diagnostics to cout and pulls in several dependencies. It uses another library by the same programmer as its core, and not surprisingly that also uses stb_truetype.

Sorry, but that isn't usable at all.

imgui can render to a software buffer so it has no dependencies at all on what system is backing the app.

This is already a thing now.