Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
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.
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.