Cross-platform 2D and 3D game engine
You might give rbfx a try. It's a fork of Urho3D which is also good, though aging. While they do verge into engine territory, they're not editor-based as Unity and Godot are, and in fact the editors for each are quite rudimentary and unfinished. For a programming-centric workflow, they're pretty nice.
Game Engine Renderer Architecture regarding UI
1 project | reddit.com/r/gamedev | 26 Mar 2022
achieving 00's / ps2 graphics
1 project | reddit.com/r/gamedev | 25 Sep 2021
What code only engines for C or C++ are there?
1 project | reddit.com/r/gamedev | 8 Aug 2021
Workflows, Artisans, Manufactories and Inflation
1 project | reddit.com/r/RiseOfHegemony | 10 Mar 2021
What are the best C++ frameworks for desktop applications?
1 project | reddit.com/r/cpp_questions | 10 Feb 2021