OAI4J is a Java library that implements a client API for the OAI-PMH standard specification from the Open Archives Initiative. It also has support for the upcoming OAI-ORE specification.
FathomFive is a classification aware lucene powered spidering and indexing solution, written in pure Java. It supports a variety of content types, provides an easy to use admin interface, and a customisable search interface. It spiders from HTTP and OAI.
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OJAX provides - a meta-search service with a highly dynamic AJAX based user interface. - an OAI-PMH harvester to harvest multiple repositories to a single Lucene index - an easy to use, highly discoverable user interface to searching that index.
i-Tor is a set of Tools and Technologies for Open Repositories, based on Linux, Java, MySQL, Mirage and other free components. It harvests OAI and turns databases into Open Archives. It includes similarity, backlinks and related search based on Lucene.