- Zenmap - Graphical frontend for the Nmap network scanner.
- Tcpdump - Command-line packet analyzer.
- Wireshark - Powerful network protocol analyzer.
- Networkminer - Network forensic analysis tool.
- Packet Tracer - Network simulation and visualization tool.
- pfSense - Open-source firewall and router platform.
- ProxySquid - Proxy server and web cache daemon.
- SNORT - Open-source intrusion detection system.
- Fail2ban - Intrusion prevention software that protects servers from brute-force attacks.
- Whatweb - Web scanner that identifies technologies used on websites.
- Wfuzz - Web application security testing tool for brute forcing.
- WPscan - WordPress vulnerability scanner.
- Shodan - Search engine for internet-connected devices.
- Metasploit - Framework for developing, testing, and executing exploit code.
- Ettercap - Network security tool for man-in-the-middle attacks.
- Wifite - Wireless network auditing tool.
- Empire - Post-exploitation framework.
- DIE-engine - Open-source security tool for Dynamic Instrumentation Engine.
- dnSpy - .NET debugger and assembly editor.
- SQLmap - Automated SQL injection and database takeover tool.
- Volatility - Advanced memory forensics framework.
- Foremost - File recovery tool for forensic investigations.
- Bulk Extractor - Digital forensics tool for extracting information from various file formats.
- Sysinternals - Suite of advanced system utilities for Windows.
- Nirsoft - Collection of utilities for system monitoring and troubleshooting.
- Event Viewer - Windows tool for viewing logs and system events.
- SCAP & STIG - Security Content Automation Protocol and Security Technical Implementation Guides.
- Bitsight Security Rating - Security ratings platform for risk assessment.
- PhishTank
- Weakpass Database
- Exploit Database
- Shodan
- OSINT
- Secure Messaging Apps Comparison
- Opsec-guide
- Have I Been Pwned
- VirusTotal
- OWASP
- MITRE ATT&CK