AdTargeting.io - AdTargeting - #1 Free Facebook Interest targeting tool. It enables you to discover hidden or niche interests, and max the ROI of Facebook ad targeting, with millions of daily updates on keyword search and trend database.
upRive - Create and scale Facebook ads quickly and efficiently
InterestExplorer - Discover 1000's of hidden Facebook interests to target.
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
AdEspresso - Optimize your Facebook Ads Easily, Like Morning Coffee
Facebook Ad Hunter - Facebook Ad Hunter uncovers hidden audiences to target when running Facebook Ads.