ImageMagick
Software suite to create, edit, and compose bitmap images.
www.imagemagick.org
X.Org Foundation
Develops, evolves, and maintains the X Window System, a system-architecture neutral, network-transparent windowing and user interface standard.
www.x.org
X Window System Glossary
Official glossary of X Window System terminology.
www.rahul.net/kenton/xglossary.html
Wikipedia: X Window System
The X Window System (commonly X11 or X) is a networking and display protocol which provides windowing on bitmap displays.
en.wikipedia.org/wiki/X_window_system
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