Paint.NET
Description
Paint.NET is raster graphics software that can be used to design and manipulate raster images. It is basically either a souped-up version of MSPaint or a simplified version of Photoshop/GIMP depending on your perspective. It is very useful for simple edits to photographs and other raster images.
Availability
Paint.Net is free software, anyone can download and install it for free on their personal computer.
Install Link: http://www.getpaint.net/download.html
Getting Started
Tutorials and information can be found at http://forums.getpaint.net/index.php?/forum/18-tutorials-publishing-only/.