XAP might refer to:

• Apache XAP, (eXtensible Ajax Platform), a software product presently under development at the Apache Software Foundation
• XAP processor, a CPU architecture for computers, developed by Cambridge Consultants since 1994
• XAP (Extensible Authoring Publishing), an old name for Extensible Metadata Platform (XMP)
• XAP (file format), container format for mobile apps and Silverlight web apps
• XAP, The IATA airport code for Chapecó Airport
• xAP Home Automation protocol
• XAP, The ICAO Code for Midway Connection, operated by Fischer Brothers Aviation of the United States

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