There are two products that implement Galera Cluster:
Percona XtraDB Cluster—Percona XtraDB Cluster is a high availability and high scalability solution for MySQL users. Percona XtraDB Cluster integrates Percona Server with the Galera library of high availability solutions in a single product package.
For more information, see http://www.percona.com/software/percona-xtradb-cluster.
MariaDB Galera Cluster—MariaDB Galera Cluster uses the Galera library for the replication implementation. To interface with the Galera Replication Plugin, MariaDB is enhanced to support the replication API definition in the wsrep API project.
For more information, see https://kb.askmonty.org/en/what-is-mariadb-galera-cluster/.