XDM

• X display manager, a part of the X Window System architecture
• XDM (display manager), the default display manager included with the X Window System
• XDM (file format), the Extensible Device Metadata open format for including depth maps and other metadata in standard image files
• XQuery and XPath Data Model
• Cross-document messaging, that works around the limits set by the same origin policy in a web browser

• Springfield Armory XD-M, a pistol series sold in the United States by Springfield Armory, Inc.

• XDM: X-Treme Dungeon Mastery, a role-playing game supplement by Tracy Hickman, Curtis Hickman and Howard Tayler.

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