WP Clean Up Optimizer will extensively clean up your WordPress database along with Optimizing without manual queries.
Optimizes the WordPress Database after Cleaning it out
WP-Sweep allows you to clean up unused, orphaned and duplicated data in your WordPress. It also optimizes your database tables.
Cleanup Duplicate Meta gives you a tool to check for and delete duplicate Post and/or User Meta entries in the database tables.
WUCO aka WP Ultimate Cleanup & Optimization, a free easy to use yet effective plugin designed to help you keep your MySQL database clean.
Help you clean out redundant & repetitive post revisions and thin out the database.
The Nova Dashboard Cleanup removes all those unwanted dashboard Widgets.