"Lucene (Lucene)":http://lucene.apache.org/ is a Java-based open source toolkit for text indexing and searching. It is easy to use, flexible, and powerful -- a model of good object-oriented software architecture. Powerful abstractions and useful concrete implementations make Lucene very flexible, and allow new users to get up and running quickly and painlessly. Read the full article - "The Lucene search engine: Powerful, flexible, and free (The Lucene search engine: Powerful, flexible, and free)":http://www.javaworld.com/jw-09-2000/jw-0915-lucene.html.
"Lucene - Wikipedia (Lucene - Wikipedia)":http://en.wikipedia.org/wiki/Lucene