Lucene project also contains a workspace, Lucene Sandbox, that is open to all Lucene committers, as well as a few other developers. The purpose of the Sandbox is to host various third party contributions, and to serve as a place to try out new ideas and prepare them for inclusion into the core Lucene distribution.
Users are free to experiment with the components developed in the Sandbox, but Sandbox components will not necessarily be maintained, particularly in their current state.

You can access the Lucene Sandbox CVS repository at http://cvs.apache.org/viewcvs/jakarta-lucene-sandbox/.

Indyo

Indyo is a datasource-independent Lucene indexing framework. A tutorial for using Indyo can be found here.

LARM

LARM is a web crawler optimized for large intranets with up to a couple of hundred hosts. Technical Overview

Snowball Stemmers for Lucene

This project provides pre-compiled versions of the Snowball stemmers for Lucene. More information can be found here. Background information on Snowball, which is a language for stemmers developed by Martin Porter.

Ant

The Ant project is a useful Ant task that creates a Lucene index out of an Ant fileset. It also contains an example HTML parser that uses JTidy. The CVS repository for the Ant contribution.

SearchBean

SearchBean is a UI component that can be used to browse through the results of a Lucene search. The SearchBean searches the index for a given query string, retrieves the hits, and then brings them into the HitsIterator class, which can be used for paging and sorting through search results. The CVS repository for the SearchBean contribution. Background information on Snowball, which is a language for stemmers developed by Martin Porter.

Ant

The Ant project is a useful Ant task that creates a Lucene index out of an Ant fileset. It also contains an example HTML parser that uses JTidy. The CVS repository for the Ant contribution.

SearchBean

SearchBean is a UI component that can be used to browse through the results of a Lucene search. The SearchBean searches the index for a given query string, retrieves the hits, and then brings them into the HitsIterator class, which can be used for paging and sorting through search results. The CVS repository for the SearchBean contribution.