ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Little Card Editor - creates & tweets cards a picture w text overlay
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Phonto - Text on Photos
LightShot - The fastest way to take a customizable screenshot.
PhotoCopyThis - PhotoCopyThis is a simple yet powerful application that allows you to copy and share text from an image within a few clicks.