Spam Check - A free JSON API to check your email messages' spam scores
Senders - Caller ID for your email
Referrer Spam Remover - Remove spam bots from your Google Analytics data
LinkedIn Sales Navigator for Gmail - Rich contact profiles inside Gmail
CanIPhish - Blend social engineering with real-world phishing simulations to train your users how to detect the most advanced threats.All in a completely self-service, fast, free and modern SaaS platform.
RocketReach - RocketReach allows you to lookup email and phone for 250+ million professionals.