Have you ever wondered whether you should go with GNU Lesser General Public License v3 or the MIT License? What does the Microsoft Public License say, by the way? We need tools to visualize software licenses in order to better understand them, respect them and (eventually) apply them to our software systems.
tl;dr legal is a marvelous website, which helps you to understand the most famous open-source licenses.
Once you find the license you are looking for, tl;dr legal summarizes it using a short, human-readable visual summary à la Creative Commons. You can also compare opensource licenses (e.g., Apache License v2.0 vs. BSD 3-Clause License).