RmlUi VS rbfx

How about https://github.com/mikke89/RmlUi ?

Check out these: https://github.com/ocornut/imgui https://github.com/mikke89/RmlUi

See the release notes here: https://github.com/mikke89/RmlUi/releases/tag/5.0

You're right, it's a fork of libRocket. The original library hasn't seen any development in years, so in a sense RmlUi is a continuation of it too. There's been a lot of changes since then, you can see all of it in the full changelog here.

I haven't actually used either one, but there's HikoGUI (previously known as TTauri) under the Boost license and RmlUI under MIT. Not sure if they're very OS-integrated in the way you want or not.

RmlUI

good engines for C++ that meet your requirements https://github.com/u3d-community/U3D https://github.com/rbfx/rbfx i highly recommend taking a look at rbfx, U3D doesn't have all the fancy features that rbfx has but deep down they are the same engine almost. They are forks of Urho3D, a mature engine that has existed from the year of 2011/2010.

Urho3D is dead. There is the U3D project which is essentially a maintenance fork made after the original project was taken over by a crazy Russian nationalist. There is also rbfx which is a progression fork that is working to make improvements such as to the PBR rendering pipeline, making it work with C# if desired, as well as rebuilding and improving the editor. The original Urho3D is soon to be even more dead than currently, since the discourse forum is set for archival and deactivation at 4:00 AM tomorrow morning.

Go to: https://github.com/rbfx/rbfx, they have a discord but IIRC it's basically just a CMake build so you flip the flags to say "WebGL" or "Emscripten" or w/e and CMake will basically tell you everything that's wrong.

If anyone is looking for a Unity alternative, the guys at rbfx are doing a great job revamping the old Urho3D codebase: https://github.com/rbfx/rbfx

It has good C# scripting support, a nice editor and modern rendering pipeline.

You could try Urho3D or its newer fork rbfx.

I use an engine called rbfx which is a fork of the Urho3D engine. A lot of it is just the fact that I've been using it for over a decade, so I am comfortable with it. I'm a programmer, not really comfortable with integrated editor engines such as Unity or Godot, and the easy C++ extensibility of the engine appeals to me. Plus it's decently powerful, and well supported on a lot of platforms (I build for Windows, WebGL, and very occasionally RPi for the most part) and is open source to satisfy that stubbornly libertarian side of my character.