IcoFX - IcoFX is an all-in-one solution for icon creation, extraction and editing.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
PhotoFlare - Quick, simple but powerful Cross Platform image editor.
VistaCreate - The VistaCreate is a free and global digital platform which is known for sharing, searching, finding, and creating great art.
Fotografix - In addition to being totally portable, Fotografix has a ridiculously small footprint.