MariaDB, one of the well known forks of MySQL, is out today with version 10 of its open-source database software.
The general availability release of MariaDB 10 happened this morning to end out March. In cooperation with Google, Fusion-IO, and other organizations, MariaDB developers improved the database performance -- they claim it's "many times faster" than previous generations of MariaDB and the legacy MySQL. MariaDB 10 also claims that its replication slaves are now crash-safe, there's support to replicate data from mltiple master servers, MariaDB picked up various NoSQL capabilities, and there's built-in sharding with the SPIDER engine.
More details on MariaDB 10 can be learned from the official release announcement on the project's site at MariaDB.org