Nutty - bit surprised that someone as clearly able to source lots of different sources as you are has to ask who Bellingcat is!
For my money, they (and their founder Elliot Higgins) are amongst the best and most reliable open source investigators around.
Have a look at
http://www.bellingcat.com/about/
In there is an account of their two most famous investigations, including this:
In July 2014, MH17 was shot down over eastern Ukraine. Over the next four years Bellingcat discovered key information about the downing of MH17, including tracking the missile launcher that shot down MH17 from its base in Russia to Ukraine, locating the field where the missile was launched from, and identifying a number of suspects involved with the incident. Bellingcat identified that the Russian military was involved years before it was confirmed by European officials.
After the poisoning of MI6 double agent Sergei Skripal and his daughter Yulia in Salisbury in March 2018, Bellingcat has been able to unmask three suspects that we’ve identified as high-ranking Russian military intelligence officers. In October 2018, our researchers appeared at a press briefing at the House of Commons to detail findings about two of the suspects, which supported Britain’s assertion that Moscow had been behind the nerve agent attack. Our investigation into the attacks, which is ongoing, continues to receive significant global attention, from media outlets and governments alike.
And, of course there is also much about more current stuff, including Ukraine, Syria, etc
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