Reference This Page contains links that I frequently use. Maybe it will help.

WEB LINK
csian98 https://csian98.github.io
BeZoey https://bezoey.com
OWASP https://owasp.org
Shodan https://www.shodan.io
VirusTotal https://www.virustotal.com
Exploit DB https://www.exploit-db.com
IP Tracker https://www.ip-tracker.org
Secure CAST https://securecast.co.kr
Packet Storm https://packetstormsecurity.com
Have I Been Pwned? https://haveibeenpwned.com
AbuseIPDB https://www.abuseipdb.com
Korea Data Portal https://www.data.go.kr
Japan Data Portal https://www.stat.go.jp
US Data Portal https://data.go
UK Data Portal https://data.gov.uk
EU Data Portal https://data.europa.eu
China Data Portal https://data.stats.gov.cn