NPS Image Editor is a free, unique image editing program that is perfect for pixel art, drawing, and photo editing. It is lightweight, customizable, and intuitive, yet surprisingly powerful. This version is designed for older systems running Windows 98, XP, Vista, and 7 and requires .NET Framework 2.0; read more on the website.
Adds layer blending modes and better theme support (NPS 3.4.5 feature cut)
Full installer, recommended for most users. May require admin rights.