The best Relational Database alternative to HeidiSQL is DbGate, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to HeidiSQL and three of them are Relational Databases so hopefully you can find a suitable replacement. Other interesting Relational Database alternatives to HeidiSQL are PgManage and Enhanced SQL Portal (ESP).
DbGate is cross-platform database manager. Simple and effective, allowing to work with many various databases simultaneously - SQL and NoSQL.
PgManage is a modern graphical database client and administration toolkit, with a primary focus on PostgreSQL while also supporting other databases.
Manage MySQL databases simply, beautiful data views, customized forms, and other extensions on the capabilities of MySQL using this web-based administration tool.
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