X.org is a single-letter second-level internet domain name.

It may also refer to:

• X.Org Foundation, a community-based foundation which took over X stewardship in 2004
• X.Org Server, the reference implementation of X developed by the Foundation
• X.Org, the organization in charge of X standards from 1999, as part of The Open Group

See also

• X.com
• X Window System, a windowing system for bitmap displays, common on UNIX-like computer operating systems

This disambiguation page lists articles associated with the title X.Org.
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