OSINT.sh
If you're looking for a one stop shop for OSINT tools, look no further. OSINT.sh is a great directory of tools and resources for unpacking data from your investigation. The applications and use cases lean more towards the cybersecurity industry; however, there's plenty of overlap to be found. The services in particular that I like are the reverse Google Adsense tool, the OCR text extractor, and the technology lookup. Here's a master list of all of the tools OSINT.sh offers: Public Buckets Subdomain Finder DNS History Reverse IP Technology Lookup Certificate Search DNS Lookup Email Finder Reverse Google Analytics Reverse Google Adsense Whois History Reverse Whois Reverse Domain OCR Text Extractor Guess MD5 Hash NMAP Scanner SSL Checker IP GEO Location Lookup Reverse MX Record Reverse Name Server SSL Poodle Check