Lucene

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**Lucene**
Domain	Text Retrieval
Media
Task
Creation Date
Copyright	free download
URL	http://lucene.apache.org/java/docs/

Description

Apache Lucene(TM) is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.
Lucene offers powerful features through a simple API:
- Scalable, High-Performance Indexing
  - over 20MB/minute on Pentium M 1.5GHz
  - small RAM requirements -- only 1MB heap
  - incremental indexing as fast as batch indexing
  - index size roughly 20-30% the size of text indexed
- Powerful, Accurate and Efficient Search Algorithms
  - ranked searching -- best results returned first
  - many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more
  - fielded searching (e.g., title, author, contents)
  - date-range searching
  - sorting by any field
  - multiple-index searching with merged results
  - allows simultaneous update and searching
- Cross-Platform Solution
  - Available as Open Source software under the Apache License which lets you use Lucene in both commercial and Open Source programs
  - 100%-pure Java
  - Implementations in other programming languages available that are index-compatible