xdot.py is an interactive viewer for graphs written in Graphviz's dot language. It internally uses the graphviz's xdot output format as an intermediate format and PyGTK and Cairo for rendering. It can be used either as a standalone application from command line or as a library embedded in a Python application.
xemmai is a dynamic programming language. It has lambda closures, classes, exceptions, modules, threads, and fibers. It is implemented in C++ and has a C++ friendly API to implement extension modules. It aims to be a general purpose glue language. It runs on Linux, Windows, and hopefully other Unix systems. Internally, codes are executed on a byte code interpreter. It also has a concurrent garbage collector to utilize multiple processors.
xfigchart.pl is a quick and easy way to create bar charts. It uses a commandline interface and takes data values as a table from stdin and writes an XFig file to stdout. Postprocessing of the bar charts is done manually using the free vector drawing tool XFig, with which it is possible to create very complex diagrams mixed with other graphics components in a short time and to use a variety of export filters (PostScript, LaTeX, PNG, etc.).
xhtml2pdf converts HTML/XHTML/XHML to PDF using the ReportLab Toolkit, the HTML5lib, and pyPdf. It supports HTML 5 and CSS 2.1 (and some of CSS 3). The main benefit of this tool that a user with Web skills like HTML and CSS is able to generate PDF templates very quickly without learning new technologies.
xlSQL is a JDBC Driver for Excel, CSV, and other document data sources. Documents can be read and written with SQL as if they were tables in a database. In the case of Excel, xlSQL maps a directory with Excel files to a database, workbooks to schemas, and sheets to tables. These tables can be queried with the full SELECT syntax of either the HSQLDB, MySQL, or McKoi SQL dialect. Native xlSQL is a rich subset of SQL for creating, altering, and populating documents.
The aim of xloops is to calculate 1PI Feynman diagrams with one or two closed loops for arbitrary processes in the Standard Model of particles and related theories. Results can be returned both algebraically and numerically. All necessary tensor integrals are treated for arbitrary masses and momenta. xloops-GiNaC is a partial re-implementation of the original xloops program based on the GiNaC C++ library for symbolic computation. It currently supports calculating one-loop 1-, 2-, and 3-point integrals to any tensor rank.