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Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
VS Code - Build and debug modern web and cloud applications, by Microsoft
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
AppyBuilder - An App Inventor 2 spin-off. Formerly called AILiveComplete.
Brackets - A modern, open source text editor that understands web design