Speedy Painter is an OpenGL-based paint software. It will only work if your graphics card supports OpenGL 3.0 (which will almost certainly be supported unless your hardware is older than 6 years).

Features include:

• Layers
• Rich brush engine
• Size and opacity of brush strokes determined by pen pressure
• Selection mask
• Reference view to assist in creating a painting based on a reference image.
• Perspective grid overlay
• Replay of paint process
• Export of paint process into a AVI video file