Open Source Intelligence Handbook Here's a useful resource...actually a compendium of resources...that should be in any patriot's toolkit.

>Given the speed of change on the web, some might question the wisdom of pulling together
>such a resource. What’s wrong with the Top 10 tools, or the Top 100? There are only so many
>resources one can bookmark after all. Such arguments are not without merit. My fear,
>however, is that they are also shortsighted. I offer four reasons why.
> .
>To begin, a shortlist betrays the widening spectrum of OSINT practice. Whereas OSINT was
>once the preserve of analysts working in national security, it now embraces a growing class
>of professionals in fields as diverse as journalism, cybersecurity, investment research, crisis
>management and human rights. A limited toolkit can never satisfy all of these constituencies.
> .
>Second, a good OSINT practitioner is someone who is comfortable working with different
>tools, sources and collection strategies. The temptation toward narrow specialisation in
>OSINT is one that has to be resisted. Why? Because no research task is ever as tidy as the
>customer’s requirements are likely to suggest.
> .
>Third, is the inevitable realisation that good tool awareness is equivalent to good source
>awareness. Indeed, the right tool can determine whether you harvest the right information. It
>follows that the more tools you have in your portfolio, the more flexible your OSINT
>capabilities are likely to be.
> .
>Finally, the process of compiling this handbook is an intelligence exercise in its own right,
>alerting us to where we are at as a community and the challenges we are likely to face going
>forward – not least of which are disinformation, the fracturing of the internet, the proliferation
>of niche social media platforms, and the urgent need for better tools to monitor and analyse
>the content they provide.
 

https://i-intelligence.eu/uploads/public-documents/OSINT_Handbook_2020.pdf