Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Inbox Creature - A super cute virtual pet, delivered right to your inbox.
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.
HippityPip - Teach phone numbers to kids
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!