Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Typorama - Typorama: Text on Photo Editor is a Typography Art and Poster Maker application created and published by Apperto Ltd.
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.
Bold - Ultra-fast anonymous publishing platform.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
TypeSlab - Simple, shareable typographic posters