lorax - FYI - any site that was built on MySQl before 5.5 will still be running on MyISAM tables unless the site admin actively did something to convert to InnoDB.
As an aside, one should be careful about converting willy-nilly between MyISAM and InnoDB. As just one example, InnoDB by default has a lower max index length, being set to something like 765 bytes (as opposed to 1000+ for MyISAM).
If you have an index that's on a VARCHAR(255) field, that's all good... until you go fully international and switch to the utf8mb4 character set to support full Unicode... which means that your VARCHAR field now has 1020 bytes (255 chars * 4 bytes/char) and your site crashes.
If you want a nice GUI tool, check out SQLYog or HeidiSQL (the former being nicer in most respects, the latter having a great search feature though where it will search through all tables for text)