XQuartz: Open-Source X Window System for Mac
XQuartz is an open-source project aiming to seamlessly integrate an x.org X Window Systems variant into Apple’s Mac OS X environment. Along with supporting applications and libraries, it delivers the X11.app, historically included with various OS X versions by Apple. The installation package includes multiple software components with diverse licenses, detailed on the official X.Org licenses page. Users can easily access non-official updates to stay current with open-source developments, where Apple actively participates.
XQuartz offers a straightforward download process and effectively fulfills its intended purpose, although it may be more suitable for experienced users due to the lack of official Apple updates.