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