- http://www.xquartz.org
- https://github.com/XQuartz
- http://www.x.org/
- https://dl.bintray.com/xquartz/downloads/XQuartz-2.7.11.dmg
- https://dl.bintray.com/xquartz/legacy-downloads/Leopard/X11-2.6.3.dmg
- http://www.x.org/archive/current/doc/xorg-docs/License.html
- https://github.com/XQuartz/quartz-wm
- https://github.com/XQuartz/quartz-wm/blob/master/COPYING
- https://www.cloudflare.com
- https://www.bintray.com/xquartz/downloads