Personally, I'm a fan of Qt. But I've also done some Dear Imgui stuff and liked it. https://www.dearimgui.com/ I also liked JUCE, but that was for an audio plugin (JUCE has a full UI kit)
this post was submitted on 08 Jun 2025
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What you are looking for must be Copperspice: https://www.copperspice.com/ It checks all your boxes, since it is a hard fork of Qt, but doesn't use the moc and only an open source licence. Since you haven't even tried to explain why you won't use Qt, it is a little difficult to help with an alternative.
That being said, it really sounds like what you are looking for is Qt ๐คท
I just want to find some alternatives to Qt. Because I'm confused by this: https://www.qt.io/pricing
What are your expectations?
Most Qt modules are licensed under LGPL (in the Open Source edition of Qt) which allows you to distribute (and sell) your software without having to release your source code - AS LONG AS you use the dynamically linked version of Qt (i.e. the default: unless you recompile Qt yourself, you'll have the correct configuration already).
As long as you keep an eye out for that, there should be no issues.
Additionally, keep in mind the lrelease tool for finding out all the Qt DLLs that your app will depend on.
Technically, you can still sell your software under the GPL license, which some Qt modules are licensed under, but you may need to provide your source code if requested by a customer.
Disclaimer: Not a lawyer, just a user.