The Bellingcat investigatory website has published its openly and freely available digital list of tools and methods it uses during open source investigations. This is version 3.1 (as of March 1st 2018). Bellingcat says that the list includes satellite and mapping services, tools for verifying photos and videos, websites to archive hyperlinks, and much more. The list is long, and may seem daunting; and there are guides at the end of the document, highlighting the methods and use of these tools in further detail. A visual reference for the main open source research tools and platforms available online has also been produced and is shown below.
https://docs.google.com/document/d/1BfLPJpRtyq4RFtHJoNpvWQjmGnyVkfE2HYoICKOGguA/edit
raytodd.blog 