phpMyAdmin - phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web.
Adminer - Adminer (formerly phpMinAdmin) is a full-featured database management tool written in PHP.
Vty - Database Manager for Mysql, written with Php.
dbMonitor - dbMonitor performs per-component tracing of commit, rollback, SQL statement execute, creating/destroying components, connection pooling events, etc.
HeidiSQL - HeidiSQL is a powerful and easy client for MySQL, MariaDB, Microsoft SQL Server and PostgreSQL. Open source and entirely free to use.
PHPLiteAdmin - For SQLite what phpMyAdmin is for MySQL - the perfect administration tool