TheoryPaint

TheoryPaint is a raster graphics editor by Theorysonic. It was first released in 1981 for TS-OS 5.

Features

 * 100+ preset pens, pencils, brushes, and markers.
 * More layers.
 * Full layer controls with 18 layer blending modes.
 * Advanced selection tools (marquee, lasso, magic wand).
 * Gradient fills tools (linear, radial).