jordiexvision/ofxQt is an open source project licensed under MIT License which is an OSI approved license.
A framework for building native Windows apps with React.
openFrameworks is a community-developed cross platform toolkit for creative coding in C++.
Scout APM - Leading-edge performance monitoring starting at $39/month. Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
Cinder is a community-developed, free and open source library for professional-quality creative coding in C++.
Modern looking cross-platform GUI library?
reddit.com/r/cpp_questions | 2021-04-04
There's a Qt integration for oF here: https://github.com/jordiexvision/ofxQt, but it's a bit dated.