Referrer Spam Remover - Remove spam bots from your Google Analytics data
Ugly Email for FireFox - Get back your email privacy, block email tracking
Spam Check - A free JSON API to check your email messages' spam scores
PixelBlock - Block email open tracking inside of 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.
MailTrackerBlocker - Developer solving interesting problems with APIs. OSS contributor (Slim Framework, rst2pdf, OpenWhisk) & amateur photographer. He/him.