Shodan - Search for devies connected to the internet --> https://www.shodan.io
Wigle - Database of wireless networks, with statistics --> https://www.wigle.net
Grep App - Search across a half milion git repos --> https://grep.app
Criminal IP - Search for devices connected to the internet. Monitor potential attack vectors --> https://www.criminalip.io
Binary Edge - Scans the internet for threat intelligence --> https://www.binaryedge.io
ONYPHE - Collects cyber-threat intelligence data --> https://www.onyphe.io
GreyNoise - Search for devices connected to the internet --> https://www.greynoise.io
CyberGordon - Cyber reputation checks --> https://cybergordon.com
Censys - Assessing attack surface for internet connected devices --> https://censys.io
Hunter - Search for email addresses belonging to a website --> https://hunter.io
Fofa - Search for various threat intelligence --> https://fofa.so/
ZoomEye - Gather information about targets --> https://www.zoomeye.org/
LeakIX - Search publicly indexed information --> https://www.leakix.net
IntelligenceX - Search Tor, I2P, data leaks, domains and emails --> https://intelx.io
Netlas - Search and monitor internet connected assets --> https://netlas.io
URL Scan - Free Service to scan and analyse websites --> https://urlscan.io
PublicWWW - Marketing and affiliate marketing research --> https://publicwww.com
FullHunt - Search and discovery attack surfaces --> https://fullhunt.io
CRT sh - Search for certs that have been logged by CT --> https://crt.sh
Vulners - Search vulnerabilities in a large Database --> https://vulners.com
Pulsedive - Search for threat intelligence --> https://pulsedive.com
Packet Storm Security - Browse lateset vulnerabilities and exploits --> https://packetstormsecurity.com
GrayHatWarefare - Search public S3 buckets --> https://grayhatwarfare.com