Computers
- APP (file format), a filename extension for applications on several platforms
- Adjusted Peak Performance, a metric to measure computing performance in 64-bit processors and above
- Google Apps, a service from Google providing independently customizable versions of several Google products under a custom domain name
- Mac App Store, a digital distribution platform for Mac OS X applications
- Atom Publishing Protocol (or AtomPub), an Atom (standard) protocol to create and update web resources
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