- Chrome
- Advanced Google Search
- Google Custom Search Engines, using Advanced Operators
- Yahoo Reverse Image Search
- LinkedIn.com People and Content Search
- LinkedIn Recruiter
- Social List
- Social List Contact Finder
- Connectifier Social Links
- Lusha
- Rocketreach
- Hunter.io
- Pipl.com
- Finding People by Email on LinkedIn
- Intelligence Search for Facebook [gone now]
- Email Extractor
- Instant Data Scraper
- Outwit Hub
- Github Search for Users and Files
- Github Hacks for Finding Emails
- Grammarly
What about you?