DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.

AnyMailFinder.com - Find anyone's email address

Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.

Atomic Email Hunter - Atomic Email Hunter is an incredibly robust tool that specializes in extracting email addresses, along with usernames, from various webpages.

Maltego - Maltego is an open source intelligence and forensics application.

Scrape - Gather all website emails in seconds