PAINT.NET is a freeware raster graphics editor program for Microsoft Windows, developed on the .NET Framework. paint.net was originally created by Rick Brewster as a Washington State University student project, and has evolved from a simple replacement for the Microsoft Paint program into an editor with support for layers, blending, transparency, and plugins.
Of course you can get PAINT.NET at Ninite.
PAINT.NET tutorials on YouTube
Good-N-Free Meetup 