BuiltWith - Find out the technology behind websites
InterestExplorer - Discover 1000's of hidden Facebook interests to target.
Kompyte - Track & analyze competitors in real time.
upRive - Create and scale Facebook ads quickly and efficiently
Competera - Competera is a price tracking tool for performance-oriented eCommerce retail and brands of all sizes worldwide.
Facebook Ad Hunter - Facebook Ad Hunter uncovers hidden audiences to target when running Facebook Ads.