Qt
Xamarin
GTK
WompMobile
Oracle Mobile Application
wxWidgets
OutSystems
Mendix
StackHive
GitHub Codespaces
CloudShell
CodeTasty
Dirigible
CodeAbbey
Slingcode
StackBlitz
StackHiveXamarin - Create iOS, Android and Mac apps in C#
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
WompMobile - WompMobile offers tow kind of functions โ first creating new mobile apps and secondly converting the websites into mobile applications.
CodeTasty - CodeTasty is a programming platform for developers in the cloud.