$$ \def\E{\mathbb{E}} %expectation \def\P{\mathbb{P}} %prob \def\var{\mathbb{V}} %var \def\T{\mathrm{\scriptscriptstyle T}} %transpose \def\ind{\mathbbm{1}} %indicator \newcommand{\gw}[1]{\color{red}{(#1)}} \newcommand{\norm}[1]{\lVert#1\rVert} \newcommand{\abs}[1]{\lvert#1\rvert} $$

In short, from permeissive to restrictive are MIT, BSD3, Apache, and GPL. MIT is good for personal projects while GPL is better for serious company projects.

Here is a picture cited from Paul Bagwell - Just made a simple description of popular free software licenses

Licenses

A Chinese version here.