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 47 languages.

Download it from phpMyAdmin website

convert is one of the utilities bundled with the ImageMagick package, it permits a lot of images operations like converting from one format to another, resizing, rotating, etc..

Download it from ImageMagick website