Just so some are not aware, there's a new project called sixtyfps by some people who were in the Qt world for long. I didn't take a deep dive into it but it looks promising.
Elements C++ GUI library
For the past year we were evaluating EFL, QML and Flutter for our embedded TV devices after having used the first two for last 5+ years and choice was made to go with Flutter. Performance is great, license is great, and development experience, judged by the whole development team, is the best. Hence my remark on being sad as QML could have had a great future, even transitioned to modern C++ without need for separate language, if there was a huge adoption and proper choices made by the company, e.g. see https://github.com/cycfi/elements.
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JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, RTAS and AAX audio plug-ins.
Nice Elements is! I adhere to its manifesto but I wish it had no dependencies like Cairo, Skia etc. e.g. see the GUI part of JUCE (which compiles under 1MB in all) .
Audio Editing Learning Resources
1 project | reddit.com/r/cpp | 30 Dec 2022
DSP Lib for building an audio engine / player
2 projects | reddit.com/r/DSP | 15 Oct 2022
GreenWave (Free) Synth VST is now available on Itch.io
1 project | reddit.com/r/VSTi | 29 Sep 2022
Native or framework for mobile app that focuses on realtime audio processing?
1 project | news.ycombinator.com | 7 Sep 2022
Plug-in Making Experience?
2 projects | reddit.com/r/musicproduction | 1 Sep 2022