Similar to X_Window_System_コアプロトコル

Mesa (computer graphics)

Metisse

MIT License

Motif (software)

OPEN LOOK

PHIGS

Portland Project

Project Athena

Qt (software)

Rxvt

The Open Group

Tk (software)

Unity (user interface)

WxWidgets

X Toolkit Intrinsics

XDM (display manager)

X.Org Foundation

X.Org Server

Template:Desktop environments and window managers for X11 and Wayland

X11 color names

X BitMap

XCB

XDarwin

Xeyes

Xfce

Xfig