Sequoia 2.6: A Transparent Middleware Solution with firebird support
Sequoia is a transparent middleware solution for clustering, load balancing and failover services for any database. The database is distributed and replicated among several nodes and Sequonia balances the queries among nodes. It is also known to handle node failures and support for checkpointing and hot recovery. It was formerly known as the clustered JDBC project and provides high availability and performance scalability for databases.
More about it on jax magazine