Internet and Computers
- Xtra (ISP), the largest Internet service provider in New Zealand, subsidiary of Telecom
- Xtra (Macromedia), a plug-in framework for some of Adobe Systems' (ex-Macromedia) products
- EXTRA!, a brand of terminal emulators produced by Attachmate
- Yahoo!Xtra, web portal operating from 2007
- XtraMSN, former web portal operating from 2001 to 2007
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