Portable Virus Scan Tools
Online Virus Scan
Virustotal - https://www.virustotal.com/
Virscan - https://virscan.org/
Jotil Virus Scan - https://virusscan.jotti.org/
NoDistribute - https://nodistribute.com
Online Threat Maps
Cyber Map - https://cybermap.kaspersky.com/
Treat map - https://threatmap.checkpoint.com/
Talos map - https://talosintelligence.com/fullpage_maps/pulse
VirtualBox images
Microsoft Virtual machines for Developers - https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/
Others
Security tools - https://sourceforge.net/directory/security-utilities/security/os:windows/
Exploit-DB - https://www.exploit-db.com/
Robtex - https://www.robtex.com/
Netcraft Site Report - https://sitereport.netcraft.com/
Whois - https://whois.domaintools.com/
Several Tools
Nessus - Tenable vulnerability scanner
Nexpose - Rapid7 vulnerability scanner
Owasp ZAP - open-source web application security scanner
pfsense - open source firewall
Maltego - open-source intelligence and forensics
Shodan - search engine for IoT Security
Kali Linux
BDFPROXY - MITM proxy-server
Beef - Browser Exploitation framework
Bettercap - MITM attacks
Crunch - password dictionary generator
Evilgrade - Exploitation framework
MetaSploit - Exploitation framework
Reaver - brute force attack agains WIFI WPS
Veil-evasion - Exploitation framework
Weevely - web application post exploitation