TweetPilot - Grow a relevant & responsive following on Twitter
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Owlead - Grow your Twitter with valuable followers, effortless
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Tweet Hunter for Twitter - 🐣 Makers: build a high-quality Twitter audience in under 10 minutes a day.🤖 Tweet Hunter is the 1st all-in-one, AI-powered Twitter growth tool.🐙 Inspiration, scheduling, automation and more… It’s all there.🎁 < 1000 followers?
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.