Percona Tools : Software Designed for Advanced MySQL/PerconaServer Tasks, Maintenance, and Monitoring

Percona Toolkit is a collection of advanced command-line tools created by Percona support staff for the purpose of setting up MySQL and system tasks that are too difficult or complex to perform manually.

See the Documentation for a more Comprehensive Description of the Toolkit

It is a very enhanced upgrade from its Predecessor : MAATKIT (also created by Percona)