XT
- An implementation in Java of XSL Transformations (XSLT). [Open Source]
- http://www.blnz.com/xt/index.html

SAXON
- An XSLT processor, and a Java library allowing full programming capability using a similar processing model. [Open Source, MPL]
- http://saxon.sourceforge.net/

XSLTC
- A compiler from XSLT to Java bytecode. [Open Source, BSD-like]
- http://xml.apache.org/xalan-j/xsltc_usage.html

Xalan-Java
- Provides high-performance XSL stylesheet processing. [Open Source, BSD-like]
- http://xml.apache.org/xalan-j/index.html

XTask
- XSLT optional task for the Java build tool Ant. Uses XT. [Open Source]
- http://www.sdv.fr/pages/casa/html/xtask.en.html