SQL Buddy, A web-based MySQL administrator with an Ajaxed interface was designed to meet the demands of modern web developers and its completely open source and free for everyone to use.
SQL Buddy uses the MySQL user table for authentication. Therefore, you can get started right away by using users that already exist. Most people will want to login as root because this level of permissions is necessary for certain tasks (like adding users, for example). However, you can login with any user that you wish.