• Air Exel (IATA code)
• Canon Digital Rebel XT, a digital single-lens reflex camera
• Subaru XT, a sports car
• In sport, XT can mean extra time
• In telecommunication, XT can mean crosstalk

In computing:

• IBM PC XT, a personal computer
• The XT bus architecture
• Crosstalk, an electrical interference caused by a wire carrying an electrical signal.
• The corollary to XP (Extreme Programming) is XT (Extreme Testing)
• XT versions of Radeon graphics cards
• XT XSLT is an implementation in Java of XSLT, created by James Clark
• Intrinsics or X toolkit, or Xt, a library providing an object-oriented-looking API for the X Window System.