Draftbit - Build mobile apps visually with Draftbit's pro-code, no-code platform. Source code included, of course.
Android Studio - Android development environment based on IntelliJ IDEA
Flutter.dev - Build beautiful native apps in record time 🚀
Codebots - Codebots is an AI-powered app building tool designed for people who aren’t classically trained in programming.
ASP.NET Core - With ASP.
Codename One - iOS, Android, Windows Phone native app development in Java.