The lxml XML toolkit for Python
Simple REST and HTTP API Client for .NET
Fast XML parser library in C
X3D is the open-standard format for 3D graphics scenes on the Web.
XMLJ is a Java XML Editor and validator project.
Dynamically loaded extension libraries for GNU AWK
Swapping code like burgers? Here your p2p, drag-n-drop solution
Arbitrary-precision fixed-point decimal numbers in go
EasyML serialization library, to and from XML, similar to Gson
A Java library to write and read graphml diagrams
C++ library for creating XLSX files for MS Excel 2007 and above.
Simple XML editor and XSD viewer
eXist-db is a feature rich Open Source native XML database
Simple, lightweight XML parser in C, statically or dynamically linked.
SEPA support tools and library
DECOR and ART
Simulatoralive's Java libraries and programs
A Java implementation of XProc: An XML Pipeline Language