Here is a list of over 550 FREE professional development courses to do online. Some give PD hours, some give a certificate of completion, some are just to further educate you. There is something for everyone in here regardless of the subject you teach.
I've spent months compiling this list and know how difficult it is for teachers to find online training (that's why I made the list). I've also priced this fair as it comes to less than one cent per link.
*All links were working and active as of May 1st 2016*