Cressida SynQuest for WebSphere MQ is a highly optimized, production-strength replication and synchronization tool utilizing the MQI API exit facility. It is designed to keep the content of WMQ queues on separate queue managers synchronized by performing a MirrorQ type application. SynQuest provides a solution for maintaining disaster recovery backups of queue managers in those cases where a hardware solution (i.e. mirrored disks) is impractical due to distance or associated hardware costs.
Galera wsrep provider is a dlopenable generic replication library which implements the wsrep provider API. It provides very efficient synchronous replication, and multi-master and "parallel applying" capabilities for opaque data buffers. Its primary focus is data consistency. A transaction is either committed on every node, or not at all. It works anywhere TCP works, including on WAN, and can utilize UDP multicast where available. It is used by the MySQL-wsrep patch project to create true multi-master MySQL/InnoDB clusters.