A management tool for the MySQL relational database w/ administration capabilities and a database query tool. The visual administration features provide users the ability to browse and modify database structures, including schema objects, database storage and maintain database security. An integrated query tool allows users to quickly create, edit and execute SQL queries and scripts.

MySQL Quick Admin
A kinda of clone of phpMyAdmin. Has full support for managing databases and tables online through its clean interface (from what I can tell). This might be a good solution for someone not wanting the often complex and overwhelming interface of phpMyAdmin.

phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields, manage privileges,export data into various formats and is available in 54 languages. This is the standard for managing MySQL database online.

MySQL Query Browser
The easiest visual tool for creating, executing, and optimizing SQL queries for your MySQL Database Server. The MySQL Query Browser gives you a complete set of drag-and-drop tools to visually build, analyze and manage your queries.

MySQL Administrator
A powerful visual administration tool that makes it easy to administer and monitor your MySQL environment and gain significantly better visibility into how your databases are operating. MySQL Administrator now integrates database management and maintenance into a single, seamless environment, with a clear and intuitive graphical user interface.

MySQL Workbench

a database modeling tool for MySQL. You can use it to design and create new database schemas, document existing databases and even perform complex migrations to MySQL. Not a lot of movement with this project in a very long time and the reason why DB Designer Fork should be checked out first.

DB Designer Fork
DB Designer Fork is a fork of the fabFORCE DBDesigner 4. DBDesigner is a visual database design system that integrates entity relationship design and database creation. DB Designer Fork generates SQL scripts for Oracle, SQL Server, MySQL and FireBird.

A powerful MySQL database administration and development tool that is not only sophisticated enough for professional developers, but also easy to learn for new users.

Zmanda Recovery Manager for MySQL
Simplifies the life of a Database Administrator who needs an easy-to-use yet flexible and robust backup and recovery solution for MySQL server.

A single-page solution for exploring and editing databases from a browser. Edit data just like you would in a desktop application, without submit buttons or page refreshes.

Toad for MySQL
A database development and administration tool that provides productivity features for rapidly creating and executing queries and managing complex database systems.

An advanced GUI frontend to MySQL. Includes Visual Query Builder, Visual Schema Designer, Smart Autocomplete, Intelligent Code Completion, Scheduled Data Synchronization, Powerful Migration Toolkit and much more.

WinSQL can talk to any database for which you have an ODBC driver and be the one interface to manage them all.

Applications Manager’s MySQL
Applications Manager’s MySQL monitoring feature has the ability to connect to the database source & monitor various system table column values, collect data, etc. and also notify through alerts, if the database system properties are beyond a given threshold. Applications Manager provides a web client that allows you to visualize MySQL monitoring data from your database tier alongside your application tiers.

An easy-to-use interface and a “working-horse” for web-developers using the popular MySQL-Database. It allows you to manage and browse your databases and tables from an intuitive Windows interface.