The best replacement for mysql workbench is phpmyadmin.

The best alternatives to mysql workbench are rated as following:
★★★★★  phpmyadmin
★★★★★  navicat
★★★★  toad
★★★  sqlyog
★★  sql developer
★  sequel pro
★  oracle sql developer
★  heidisql
★  sql server management studio
  dbdesigner

Your alternative for mysql workbench is not listed? Suggest!
Speaking about mysql workbench, one probably shouldn't forget about mamp.

Other search terms related to mysql workbench and their ratings are:
★★★★★ mamp
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mysql workbench
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