Carrd - Simple, responsive one-page site creator.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
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.
Straw.Page - Drag and drop site builder that works on phone
Itty bitty - A tool to create websites contained within their own link