Bellingcat's Online Investigation Toolkit
bit.ly
Bellingcat Online Researcher Survey: Tool Wishes
docs.google.com
OSINT Dojo
www.osintdojo.com
OSINT Belarus
t.me
Free OSINT Training
freetraining.dfirdiva.com
These Are the Tools Open Source Researchers Say They Need
www.bellingcat.com
OSINT Updates - a free weekly newsletter for OSINTers
osintupdates.com