I've never actually heard of SQLyog before (even though it claims to be the "most popular MySQL GUI for the last 4 years"), but its web site
is making a big deal out of the fact that this GUI front-end for MySQL is now open source, ergo free, and I certainly won't complain about there being more free MySQL front-ends in the world. To be fair, it's the "Community Edition" that's gone OSS--Enterprise will still cost you--but it does tout a solid feature set
, including a favorites manager, a tabbed query/result set editor, SQL templates, export to CSV/XML/HTML, user management, and more. With the recent death
of MySQL-Front, SQLyog is a very welcome addition to the open source family.