A Java implementation of XProc: An XML Pipeline Language
This project is now abandoned in favour of MorganaXProc-III which implements XProc 3.0: https://sourceforge.net/projects/morganaxproc-iiise/
MorganaXProc is a full implementation of XProc: An XML Pipeline Language (W3C Recommendation 11 May 2010) written in Java, supporting all required and optional steps, the steps proposed on EXProc.org and also the document templating steps "p:in-scope-names" and "p:template".
XPath 2.0 or XPath 3.0 is used as expression language.
XSLT and XQuery...
JSefa is a simple library for stream-based serialization of java objects to XML, CSV, or FLR and back again using an iterator-style interface independent of the serialization format. There is a standard and an android edition available.
A small XML library that uses SAX to parse incoming data and build Java POJO's based on the content. Configuration consists of a single call to map each top-level XML element to a Java POJO. Also, supports basic POJO -> XML serialization.