Meteor - Meteor is a set of new technologies for building top-quality web apps in a fraction of the time.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Horizon - Horizon is a realtime, open-source backend for JavaScript apps.
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.
WoofJS - Easy-to-learn JS graphic framework
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.