Hi, my GUI toolkit "Ultra App Kit" is now released with added support for Linux and Mac:
https://www.ultraengine.com/community/blogs/entry/2704-ultra-app-kit-11-adds-support-for-cross-platform-development/
Rather than using a slow HTML middle layer like many systems do, Ultra App Kit is built directly on X11/XRender (and Quartz / GDI+ on Windows / Mac, respectively) so it's snappy, responsive, and requires no additional dependencies on almost any distro. (Wayland support is planned later on, but I feel that Wayland is not quite ready for prime time yet.)
DPI scaling is baked into the design to support HD, 4K, 8K, and any other screen resolution.
I will be using this system to build cross-platform game development tools. If a fast resolution-independent cross-platform GUI toolkit is appealing to you, then you can use it too.
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