Evan's Image Editor (EIE) is a free image editor that allows for editing and creation of animated or still images. It contains several GPU-powered image modifiers that take advantage of modern graphics hardware, giving you an instant preview of the effect while you adjust parameters. It also has a non-binary selection system, allowing you to "partially select" pixels and apply drawing tool and modification actions that perform weighted averages based on the selection value.
EIE has several basic drawing tools including brushes, lines, paint bucket, rectangle, ellipse, pencil and eraser.
EIE has animated cursor read and write support. You can create your own animated cursors from scratch, convert animated GIFs to animated cursors, or convert animated cursors to animated GIFs.
EIE has a non-binary selection system which allows you to soften the edges of your selected pixel region.
EIE allows you to select multiple layers/frames at once and perform batch modifications. Modifiers can use either the GPU or CPU. CPU-based modifiers will split the processing of multiple images among multiple processors, taking advantage of systems with multi-core processors.
EIE's hue brush tool allows you to modify the defining color of pixels without changing the perceptual detail level. This shot shows the hue brush tool changing the green leaves to orange.
EIE has multiple panel layouts ("View" menu -> "Panel Layout") that allow you to see mutiple views of your image while working on it. This screenshot shows a split panel view of the image being mapped over a 3D sphere.