Digitox will help you understand your digital habits and will create usage limits for selected applications. Let digitox reminds you when you exceed your application limits. https://phosphorus-apps.github.io/
TwitterTwill is a free tool that samples your timeline and uses machine learning to help you make informed decisions on who you follow on Twitter and how to make your timeline a better place for your mental health.
Profanity & Toxicity Detection for User-Generated Content is a set of dedicated semantic models regarding toxic and aggressive content. It was made on a various type of user-generated content (comments, forums, tweets, fb, etc.).