Referrer Spam Remover - Remove spam bots from your Google Analytics data
Block Together - A useful tool which helps you block trolls on Twitter.
Spam Check - A free JSON API to check your email messages' spam scores
Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.
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.
WebPurify - Profanity Filter, Image Moderation and Video Moderation Services Made Easy.