AnyMailFinder.com - Find anyone's email address
DataWalk - DataWalk is a software platform to connect numerous large data sets, both external and internal, into a single repository for fast visual analysis.
Hunter - Find all the email addresses related to a domain
Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.
Mailmeteor - Send hundreds of personalized emails with Gmail.
Maltego - Maltego is an open source intelligence and forensics application.