Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
FINAL CUT - Library for creating terminal applications with text-based widgets
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.
termbox - Termbox is a library that helps making terminal-based pseudo-GUIs.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Slang - Slang is a powerful visual programming language using a newly developed stream-based paradigm.