P

public-domain

Android Gears 3D. https://play.google.com/store/apps/details?id=org.gears3d.gears3d

Generic, reusable and well documented public domain parallel "exact cover with colors" solver, with examples.

The MD0 license is based upon the CC0-1.0 license, but attempts to waive more Intellectual Property rights and deny patents and trademarks(no matter how fruitless; the intention shall be made clear).

https://gears3d.org

https://web-work.tools Resources for Independent Web-Workers: SEO, Publishing, Git, GitHub Pages, Indieweb, Ubuntu Linux, and Static Site Generators.