Is there a free software that can import excel into mysql on mac?
Full disclosure.. I am the author of the following program.
Give it a try and let me know what you think.
I have tried many applications including the excel add-in from MySQL, but was not satisfied with them, so I wrote my own.

The current version of my program is slow (just like the MySQL add-in), doesn't support international characters, and doesn't support command line parameters, but it is free and works well.

http://panofish.net/excel2mysql/

I am working on a much better version which will remedy the aforementioned shortcomings and should be available soon.