X
- XDP
- XDR
- XDR solution
- xDSL
- XE
- xenobiology
- xenobiotic
- xenobot
- xerographic
- xerography
- Xerox PARC
- XFCD
- XFS
- XGA
- XGMII
- XHTML
- XID
- XIE
- XIP
- XLR
- XML
- XML attack
- XML document
- XML Encryption
- XML file
- XML parser
- XML-RPC
- XMLP
- XMM
- Xmodem
- Xmodem-CRC
- XMPP
- XMS
- XNS
- XO
- XOFF
- XON
- XON/XOFF
- XOR
- XOR checksum
- XOR linked list
- XOR-linking
- XORing
- XP
- XPG3
- XPN
- xpn
- XPU
- XPXC
- XPXM
