SAX (Simple API for XML)
- Contains Namespace support and is fully configurable and extensible. [Open Source, Public Domain]
- http://www.saxproject.org/

Xineo Object-oriented API for XML (OAX)
- Offering an alternative to traditional methods for XML documents parsing. It allows large XML documents and streams to be parsed, offering a way to handle parsed data in an object-oriented way. [Open source, LGPL]
- http://software.xineo.net/oax.jspx

Xerces Java
- Advanced XML parser, including support for XML Schema, DOM Level 2, and SAX version 2. [Open Source, BSD-like]
- http://xerces.apache.org/

kXML2
- An XML pull parser and writer suitable for all Java platforms including the Java 2 Micro Edition (CLDC/MIDP/CDC). Because of its small footprint size, it is especially suited for Applets or Java applications running on mobile devices like Palm Pilots or M
- http://kxml.sourceforge.net/

Lark and Larval
- Lark is a non-validating processor implemented in the Java language; it attempts to achieve good trade-offs among compactness, completeness, and performance. Larval is a validating processor built on the same code base as Lark.
- http://www.textuality.com/Lark/

NanoXML
- Simple and small SAX XML parser. Extremely small (6kb) version without SAX interface is also available. [Open Source, zlib/libpng-like]
- http://nanoxml.cyberelf.be/

FastParser
- High performance Java XML parser, can be used with embedded device. SAX, DOM Compliant. [Shareware]
- http://www.japisoft.com/fastparser/

XML Pull Parser
- A fast parser using a pull-based approach instead of SAX. It does not read DTDs and is optimized for small documents like SOAP. [Open Source, BSD-like]
- http://www.extreme.indiana.edu/xgws/xsoap/xpp/

Piccolo XML Parser for Java
- Fast non-validating XML parser for Java supporting SAX 1, SAX 2.0.1, and JAXP 1.1. [Open Source, LGPL]
- http://piccolo.sourceforge.net/

MinML
- A small (~10Kb) Java XML parser. It accepts a subset of XML (it reads and ignores DTDs and does not support mixed content) [Open Source, BSD-like].
- http://www.wilson.co.uk/xml/minml.htm

JDOM
- Parses, manipulates, and outputs XML using standard Java constructs. API is similar to DOM, but easier to use. [Open Source, BSD-like]
- http://www.jdom.org/

XP
- Non-validating XML parser. [Open Source, BSD-like]
- http://www.jclark.com/xml/xp/index.html