XFMail
An XForms-based GUI mail reader.
XFPROT
Graphical frontend to the F-Prot Antivirus. XFree86
Implementation of the X Window System. XGlobe
Displays the earth on your desktop. XGngeo
A frontend for Gngeo, a Neo Geo emulator.
xhdbench
Qt-based X-program for testing the output speed of several devices (harddisks, CD-ROMs, floppy drives). xhkeys
A tool for your special keyboard. xkeycaps
Graphical front-end to xmodmap. xkra
This program can display .krs and .csv format files holding close price and volume. XL C++
High-performance optimizing compiler for Linux. XL Fortran Compiler for Cell BE
Develop complex, computationally-intensive programs with IBM XL Fortran Alpha Edition for Cell BE Processor on Linux. xlightframe
XLightFrame - Philips LightFrame2 for X. Xlockmore
Xlock and 90+ more modes. xlogmaster
Log files processor. XLogo
Logo interpreter, written in Java. X-Mame
X11/Unix port of the MultiArcade Machine Emulator project. XMangle
X frontend for mangle. XMapper
XMapper for the management of XSLT Transformations.
Xmas
X memory access simulator. XML Enhancements for Java
Quickly Integrate XML in Java apps for Linux. XML Forms Generator
Eclipse XML Forms Generator for Red Hat. XML Hammer
Transform, validate, and perform XPath searches on XML using any JAXP implementation.
xmlrpc-c
XML-RPC library for C and C++. XML Security Library
C library based on LibXML2.