What kind of app development “platforms,” “technologies,” or “communities” exist for Linux apps, where you might follow certain practices for designing/developing/distributing your app? There can be overlap between them. So far, I have:
• GNOME
• GTK
• Ubuntu
• KDE
• Qt
• Web app
• Electron
• Flutter
• Rust (iced?)
• Chromium-based
• Firefox-based
• Godot Engine
• Other game engine
Are there others I’m missing? Especially apps that are (or should be!) on Flathub.