NASA App - Showcases a huge collection of the latest NASA content
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
Code NASA - 253 NASA open source software projects
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.