XML Patch is a C++ library and command-line interface (the xml-diff and xml-patch commands) for patching XML files with XPath expressions.

Libxlsxwriter is a C library that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel 2007+ XLSX file.

OpenJade is an implementation of Document Style Semantics and Specification Language (DSSSL), a style language to format SGML or XML documents. It contains backends for various formats such as RTF, HTML, TeX, MIF, SGML2SGML, and FOT.

PyXB-X ("pixbix") is a pure Python package that generates Python source code for classes that correspond to data structures defined by XMLSchema.

YAWriter implements Yet Another XML::Handler::Writer. It provides a flexible escaping technique and pretty printing.

This package provides a Python library to convert XML to OrderedDict.

This module implements a Perl interface to the libxml2 library which provides interfaces for parsing and manipulating XML files. This module allows Perl programmers to make use of the highly capable validating XML parser and the high performance DOM implementation.

TinyXML2 is a small and simple XML parsing library for the C++ programming language.

This module provides an XPath engine, that can be re-used by other modules/classes that implement trees.

In order to use the XPath engine, nodes in the user module need to mimic DOM nodes. The degree of similitude between the user tree and a DOM dictates how much of the XPath features can be used. A module implementing all of the DOM should be able to use this module very easily (you might need to add the cmp method on nodes in order to get ordered result sets).

This module aims to comply exactly to the https://www.w3.org/TR/xpath and yet allow extensions to be added in the form of functions. It also provides the command xpath.

XML::RegExp contains regular expressions for the following XML tokens: BaseChar, Ideographic, Letter, Digit, Extender, CombiningChar, NameChar, EntityRef, CharRef, Reference, Name, NmToken, and AttValue.

XML::TokeParser provides a procedural ("pull mode") interface to XML::Parser in much the same way that Gisle Aas' HTML::TokeParser provides a procedural interface to HTML::Parser. XML::TokeParser splits its XML input up into "tokens", each corresponding to an XML::Parser event.

This module understands WSDL version 1.1. A WSDL file defines a set of messages to be send and received over SOAP connections. This involves encoding of the message to be send into XML, sending the message to the server, collect the answer, and finally decoding the XML to Perl.

This module extends the XML::Parser module by Clark Cooper. The XML::Parser module is built on top of XML::Parser::Expat, which is a lower level interface to James Clark's expat library. XML::DOM::Parser is derived from XML::Parser. It parses XML strings or files and builds a data structure that conforms to the API of the Document Object Model.

TinyXML is a small and simple XML parsing library for the C++ programming language.

Libxslt is an XSLT C library developed for the GNOME project. It is based on libxml for XML parsing, tree manipulation and XPath support.

The XML Security Library is a C library based on Libxml2. It supports XML security standards such as XML Signature, XML Encryption, Canonical XML (part of Libxml2) and Exclusive Canonical XML (part of Libxml2).

libebml is a C++ library to read and write EBML (Extensible Binary Meta Language) files. EBML was designed to be a simplified binary extension of XML for the purpose of storing and manipulating data in a hierarchical form with variable field lengths.

pugixml is a C++ XML processing library, which consists of a DOM-like interface with rich traversal/modification capabilities, a fast XML parser which constructs the DOM tree from an XML file/buffer, and an XPath 1.0 implementation for complex data-driven tree queries. Full Unicode support is also available, with Unicode interface variants and conversions between different Unicode encodings which happen automatically during parsing/saving.

XML::Feed is a syndication feed parser for both RSS and Atom feeds. It also implements feed auto-discovery for finding feeds, given a URI. XML::Feed supports the following syndication feed formats: RSS 0.91, RSS 1.0, RSS 2.0, Atom

This module provides a class to handle the SOAP protocol. The first implementation is http://www.w3.org/TR/2000/NOTE-SOAP-20000508/, which is still most often used.

Xlsx2csv is a program to convert Microsoft Excel 2007 XML (XLSX and XLSM) format spreadsheets into plaintext comma separated values (CSV) files. It is designed to be fast and to handle large input files.

HTML-XML-utils provides a number of simple utilities for manipulating and converting HTML and XML files in various ways. The suite consists of the following tools:

• asc2xml convert from UTF-8 to &#nnn; entities

• xml2asc convert from &#nnn; entities to UTF-8

• hxaddid add IDs to selected elements

• hxcite replace bibliographic references by hyperlinks

• hxcite mkbib - expand references and create bibliography

• hxclean apply heuristics to correct an HTML file

• hxcopy copy an HTML file while preserving relative links

• hxcount count elements and attributes in HTML or XML files

• hxextract extract selected elements

• hxincl expand included HTML or XML files

• hxindex create an alphabetically sorted index

• hxmkbib create bibliography from a template

• hxmultitoc create a table of contents for a set of HTML files

• hxname2id move some ID= or NAME= from A elements to their parents

• hxnormalize pretty-print an HTML file

• hxnsxml convert output of hxxmlns back to normal XML

• hxnum number section headings in an HTML file

• hxpipe convert XML to a format easier to parse with Perl or AWK

• hxprintlinks number links and add table of URLs at end of an HTML file

• hxprune remove marked elements from an HTML file

• hxref generate cross-references

• hxselect extract elements that match a (CSS) selector

• hxtoc insert a table of contents in an HTML file

• hxuncdata replace CDATA sections by character entities

• hxunent replace HTML predefined character entities to UTF-8

• hxunpipe convert output of pipe back to XML format

• hxunxmlns replace "global names" by XML Namespace prefixes

• hxwls list links in an HTML file

• hxxmlns replace XML Namespace prefixes by "global names"

The xmlschema library is an implementation of XML Schema for Python. It has full support for the XSD 1.0 and 1.1 standards, an XPath-based API for finding schema's elements and attributes; and can encode and decode XML data to JSON and other formats.