Extensible Text Framework (XTF): FLOSS platform for access to digital content
XTF is the California Digital Library's amazing access platform for digital content. It is based on Lucene, a tool that is well known as a scalable and stable full-text engine. But XTF is more than Lucene, and is a full end-to-end system, offering ΓΌber configurable indexing, quering and display. Java-based, completely XSLT-driven presentation-layer, extensible to things like Shibboleth, and has some very nice additioanl features like OAI-PMH provider and SRU. From what I can tell it does not have an SOA architecture, but offers a high degree of modularity which could easily be wrapped in Web services, etc

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