From the website:

Open Repository is a service from BioMed Central to build, launch, host and maintain institutional repositories for organisations. Built upon the latest DSpace repository software the service has been designed to be flexible and cost-effective. BioMed Central's economy of scale makes it possible for organisations that could not otherwise afford to, or lack the infrastructure or technical capacity in-house to run their own repositories. 

From the web site:

Compass is a first class open source Java Search Engine Framework, enabling the power of Search Engine semantics to your application stack decoratively. Built on top of the amazing Lucene Search Engine, Compass integrates seamlessly to popular development frameworks like Hibernate and Spring. It provides search capability to your application data model and synchronizes changes with the datasource. With Compass: write less code, find data quicker.

As of version 0.8, Compass also provides a Lucene Jdbc Directory implementation, allowing storing Lucene index within a database for both pure Lucene applications and Compass enabled applications. Note, when using Compass, using a database as the index storage requires only updating configuration settings.