Open source licenses grant permission to everyone to use, modify, and share licensed software for any purpose, subject to conditions preserving the provenance and openness of the software. The following licenses are arranged from one with the strongest of these conditions (GNU AGPLv3) to one with no conditions (Unlicense). Notice that the popular licenses featured on the home page (GNU GPLv3, Apache License 2.0, and MIT License) fall within this spectrum.