pglogical is a logical replication system implemented entirely as a PostgreSQL extension. This alternative to physical replication is an efficient method of replicating data using a publish/subscribe model for selective replication.
repmgr is a tool for PostgreSQL replication and failover management. repmgr simplifies administration and daily management, enhances productivity and complements built-in replication capabilities in PostgreSQL.
2ndQPostgres is an enterprise version of PostgreSQL. It includes carefully selected, quality- assured features prior to integration into communityPostgreSQL. These features maintain binary and on-disk compatibility.