https://www.virustotal.com
http://www.malware-traffic-analysis.net
https://osintframework.com
https://gchq.github.io/CyberChef/
http://icyberchef.com/
https://www.hybrid-analysis.com/
https://cve.mitre.org/
https://cybermap.kaspersky.com/
RMC: http://csl.segfaults.net
Cheat Sheet:
vim.rtorr.com
PenTest: https://highon.coffee; https://www.splunk.com; https://intruder.io; https://www.hackerone.com; https://pentest-tools.com