ReFollow: Unfollow Twitter Users Who Have No Profile Picture
Refollow is an incredible tool that allows you to unfollow people without a twitter profile, follow other peoples followers and more.
bulk unfollow twitter
Bulk Unfollow Twitter Users with JustUnfollow
I have been looking for a decent replacement for huitter mutuality and the creator of JustUnfollow had me look at their site. It is useful and simple to use.