Rufus By Jtanza - Rufus is a free, open-source web based RSS reader, designed to be both simple and fast.
FriendFilter - Auto unfriend tool for Facebook
FamousFix - Formally known as WhosDatedWho
Detox for Facebook - Replace your Facebook feed with PH, HN, DN and more.
Notify by Facebook - Notifications that matter from sources you love
Keep My Friends - A lightweight, personal CRM to improve your relationships