• The Lucene search engine Powerful flexible and free
  - JavaWorld, September 2000
• Introduction to Text Indexing with Apache Jakarta Lucene
  - Onjava.com, January 2003
• Advanced Text Indexing with Lucene
  - Onjava.com, March 2003
• Parsing, indexing, and searching XML with Digester and Lucene
  - IBM developerWorks, June 2003
• Lucene Intro
  - java.net, July 2003

• Lucene Tutorial
• Lucene introduction in Chinese

• Build your own languages with JavaCC
  - JavaWorld December 2000
• CLucene
  - C++ implementation of Lucene
• NLucene
  - .NET implementation of Lucene
• Lucene.net
  - .NET implementation of Lucene
• Lupy
  - Python implementation of Lucene
• Lucene::QueryParser
  - Perl implementation of Lucene QueryParser

• Professional Struts Applications: Building Web Sites with Struts, Object Relational Bridge, Lucene, and Velocity, by John Carnell, Jeff Linwood, and Maciej Zawadzki.
  - Contains a chapter on using Lucene with Struts, including incremental indexing, architecture, and creating an index from a data access layer.