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Applicable to many of the other answers here - the Type 1 JDBC-to-ODBC Bridge that most are referring to is the one Sun built in to.
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These components are free, for Mac, Windows, and more. My employer produces a simple, proof-of-concept HTML5-based SQL client which can be used against any ODBC data source on the web-browser host machine, through the HTML5 WebDB-to-ODBC Bridge we also produce. RazorSQL has been tested on over 40 databases, can connect to databases via either JDBC or ODBC, and includes support for the following databases. RazorSQL is an SQL query tool, database browser, SQL editor, and database administration tool for Windows, macOS, Mac OS X, Linux, and Solaris. DBeaver is a free, open source database management tool that can be used on most database management systems (such as MySQL, PostgreSQL, MariaDB. Another SQL Server GUI tool that you can use on your Mac (and Windows/Linux/Solaris) is DBeaver.
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How to Restore a Database with Azure Data Studio on a Mac Another Free SQL Server GUI – DBeaver. It gives corporate developers, DBAs and ISVs an array of new enterprise features. MySQL Database Server is designed for enterprise organizations delivering business critical database applications. SQLite's code is in the public domain, which makes it free for commercial or private use.
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