You can do it manually via GWT. I don't know any kind of free online tools for that. However, Submitting links to GWT usually gives you either poor or no result. Unless you have a manual spam action against your site I wouldn't recommend using that tool.
yup just signed up for an ahrefs account. super expensive imo. but need to get this done. so much manual work to be done now.Try ahref to get full report on your back link profile.
You should either get the webmasters to remove the links or disavow, or start with a new domain.
I was going to offer to run that report for you, but I just read you got an account yourself.