Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Dropzone - If you want your file uploads to work even without JavaScript, you can include an element with the class fallback that dropzone will remove if the browser is supported.
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.
Dropover - Mac app for easier drag & drop
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Unclutter - Unclutter is an app that is designed to help Mac users bring order to their desktop. Among other features, this powerful piece of software provides quick access to a user's notepad and clipboard.