Shodan

http://wigle.net

http://grep.app

http://app.binaryedge.io

GreyNoise

urlscan.io

Cyber Defense Search Engine

Find email addresses in seconds * Hunter (Email Hunter)

http://fofa.so

ZoomEye - Cyberspace Search Engine

LeakIX

Intelligence X

Netlas

http://searchcode.com

Source Code Search Engine

http://buckets.greyhatwarfare.com

GitHub - abathelt/EvidenceWiki: All of my threat intel recommendations for aspiring Information Security Analyst. This section contains information about evidence at analyst's disposal IP, domain, email, hash, files.