Wikipedia
Hatebase
Hatebase is a joint project of the Sentinel Project for Genocide Prevention and Mobiocracy that is described on its website as an "online repository of structured, multilingual, usage-based hate speech". It uses text analysis of speech and written content (including radio transcripts, transcripts of spoken web content, tweets, and articles) and identification of hate speech patterns within it to predict potential regional violence. The full source code for the API is available as open source code on GitHub