My company Continuent sponsors Continuent.org, an open source site that contains some of the coolest scale-out projects around. You may have heard of Sequoia, which implements middleware clustering of any database that has a JDBC driver. However, Sequoia is really just the beginning.
We have several other projects that offer interesting scale-out technologies. Myosotis implements fast SQL proxying, Hedera provides wrappers for group communications, and Bristlecone has tools for performance testing of scale-out architectures. This summer we will add projects for database neutral master/slave replication as well as cluster management. In short, there's a lot to look at.
If you would like a closer look at Continuent.org, I'm doing a Webex webinar to talk about the overall technology stack and project roadmaps. It's scheduled for Thursday June 26th at 10am EDT. You can sign up here to see what's going on.
Don't worry if you miss the presentation--I'll post slides here and will be doing a series of blog entries on each of the projects in the coming weeks.