Stipple Effect is a pixel art editor created for indie game developers, encouraging rapid and iterative creation of video game art assets. This lightweight and simple tool offers a feature-rich scripting API for automation of tasks, along with a symbiotic relationship between layers and frames, a two-color system, dither mode, blend mode, and more. Surprisingly, the program supports scripting for automation, custom previews, and color transformation, with a variety of example scripts available. Controversially, users can compile the program from source for free, but are still subject to the end-user license agreement. Overall, Stipple Effect offers a unique and powerful tool for creating pixel art.
https://github.com/jbunke/stipple-effect