Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

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.

ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...

Dropover - Mac app for easier drag & drop

LightShot - The fastest way to take a customizable screenshot.

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.