A free handbook for journalists that describes how to verify and vet information from socialmedia sources. Written by journalists from the BBC, Storyful, ABC, Digital First Media, and other news organizations. Free to download as a PDF, ePub, or kindle ebook. Available in English, Greek, French, Portuguese, Spanish, Arabic, Russian, Turkish, Coatian, and Italian.
A FOSS platform for analysing and visualizing large sets of documents. Designed with investigative journalists in mind but has other uses. Has a plugin system. Can be run as a server or locally (https://github.com/overview/overview-local). Designed to run as a docker container (bluh) but running it as-is shouldn't be difficult. Written in scala (wtf?) Seems to use postgres as its back-end.