HeidiSQL is a free and open-source administration tool for MariaDB, MySQL, as well as Microsoft SQL Server, PostgreSQL and SQLite.

In 2004, during a period of inactivity, Becker sold the MySQL-Front branding to Nils Hoyer, who continued development by cloning the original software.

[3][4] In April 2006, Becker open-sourced the application on SourceForge, renaming the project "HeidiSQL" due to having sold the MySQL-Front branding.

jHeidi—a version written in Java was designed to work on Mac and Linux computers—was discontinued in March 2010 in favor of Wine support.

Since the 8.0 release, HeidiSQL offers its GUI in about 22 languages other than English; translations are contributed by users from various countries via Transifex.