XNMR: A tool for knowledge bases exploration
XOR at a Single Vertex -- Artificial Dendrites
XORSAT: An Efficient Algorithm for the DIMACS 32-bit Parity Problem
XPath Whole Query Optimization
XPath-Logic and XPathLog: A Logic-Programming Style XML Data Manipulation Language
xPerm: fast index canonicalization for tensor computer algebra
XPS and AES studies of Hg(II) sorption and desorption reactions on sulphide minerals
XQ2P: Efficient XQuery P2P Time Series Processing
XQuery Join Graph Isolation
XRecursive: An Efficient Method to Store and Query XML Documents
XRF microCT study of space objects at SSRL
XRFs as soft extension of GRBs: evidence from swift observations
XSB: Extending Prolog with Tabled Logic Programming
XSPEC 12: Capabilities for Coded-Mask Spectral Analysis
XSPEC12: Object-Oriented X-Ray Analysis
XString: XML as a String
XTAG system - A Wide Coverage Grammar for English
XTile: An Error-Correction Package for DNA Self-Assembly
XTRA: Extraterrestrial Regolith Analyzer
XUV observations of solar corona in the spirit experiment on board the coronas-F satellite