SupraBrowser
The "Eclipse of Web Browsers", a secure social web browsing environment that runs off of your own highly personal and private data store. Written primarily in Java, it uses Gecko as its web runtime, and has a back-end driven by MySQL and Lucene.

⊛ Database Environment : XML-based
⊛ Development Status : 5 - Production/Stable
⊛ License : Eclipse Public License

More info - download: @ SourceForge