By Jackson Godwin.Cybersecurity Analyst & Penetration Tester.
In Part 1, we covered five essential penetration testing tools that every cybersecurity professional should know.
Now, let’s continue with more industry-standard open source tools trusted by ethical hackers, red teams, security consultants, and bug bounty hunters worldwide.
6. SQLmap
Category: SQL Injection Testing
SQLmap is one of the most powerful open source tools for testing web applications for SQL injection vulnerabilities.
Instead of manually testing every input field, SQLmap automates much of the process, helping security professionals determine whether a web application properly protects its database.
Key Features
- Automated SQL injection detection
- Database fingerprinting
- Database enumeration
- Support for multiple database engines
- Session management
- Data extraction (during authorized testing)
Best Used For
- Web application penetration testing
- Database security assessments
- Vulnerability validation
7. Nikto
Category: Web Server Scanner
Nikto is a fast and reliable web server scanner that identifies common web server vulnerabilities.
Although it is not a full vulnerability scanner, it quickly checks thousands of potentially dangerous configurations.
Key Features
- Dangerous file detection
- Outdated software identification
- Server misconfiguration checks
- SSL testing
- Security header analysis
Why Professionals Use It
Nikto provides quick visibility into common web server weaknesses before deeper testing begins.
8. Aircrack-ng
Category: Wireless Security Testing
Wireless networks remain attractive targets for attackers.
Aircrack-ng is a collection of open source tools used for assessing Wi-Fi security in authorized environments.
Key Features
- Wireless packet capture
- Network monitoring
- WPA/WPA2 security assessment
- Access point analysis
- Wireless traffic inspection
Best Used For
- Wireless security assessments
- Wi-Fi configuration reviews
- Security training laboratories
9. Hashcat
Category: Password Security Testing
Hashcat is one of the fastest password recovery tools available.
Security professionals use it during authorized password auditing exercises to evaluate password strength.
Key Features
- GPU acceleration
- Multiple attack modes
- Dictionary attacks
- Rule-based attacks
- Hybrid attacks
- Support for hundreds of hash types
Why It Matters
Weak passwords remain one of the leading causes of security breaches.
Hashcat helps organizations identify weak password policies before attackers do.
10. John the Ripper
Category: Password Auditing
John the Ripper has been a trusted password auditing tool for many years.
It is widely used to evaluate password complexity and identify weak credentials during authorized security assessments.
Key Features
- Password auditing
- Multiple hash support
- Dictionary attacks
- Incremental attacks
- Custom wordlists
Best Used For
- Security audits
- Password policy reviews
- Internal penetration testing
11. Hydra
Category: Authentication Security Testing
Hydra is a password auditing tool capable of testing authentication services in authorized environments.
It supports numerous protocols used across enterprise networks.
Key Features
- Multi-protocol support
- Parallel testing
- Flexible authentication modules
- Fast performance
Commonly Used With
- FTP
- SSH
- RDP
- HTTP
- HTTPS
- SMTP
- Telnet
Security teams use Hydra responsibly to evaluate the effectiveness of authentication controls.
12. Gobuster
Category: Directory and DNS Enumeration
Gobuster is a fast directory and subdomain enumeration tool.
It helps identify hidden directories, files, and virtual hosts that may not appear during normal browsing.
Key Features
- Directory enumeration
- DNS brute forcing
- Virtual host discovery
- Fast performance
- Wordlist support
Why It’s Popular
Hidden directories often expose sensitive resources, making Gobuster an important reconnaissance tool.
13. theHarvester
Category: Open Source Intelligence (OSINT)
Reconnaissance is one of the most important phases of penetration testing.
theHarvester gathers publicly available information about an organization from various online sources.
Key Features
- Email collection
- Domain information gathering
- Public host discovery
- Search engine integration
- Certificate transparency searches
Best Used For
- External reconnaissance
- OSINT investigations
- Attack surface mapping
14. Amass
Category: Attack Surface Discovery
Amass is one of the most respected tools for subdomain enumeration and external attack surface mapping.
It combines passive and active reconnaissance techniques to identify internet-facing assets.
Key Features
- Passive reconnaissance
- Active enumeration
- DNS mapping
- Asset discovery
- Attack surface visualization
Why Professionals Use It
Organizations often discover forgotten internet-facing systems using Amass during security assessments.
15. OpenVAS (Greenbone Community Edition)
Category: Vulnerability Scanning
OpenVAS is a comprehensive open source vulnerability scanner maintained by Greenbone.
It helps organizations identify known vulnerabilities across networks and systems.
Key Features
- Automated vulnerability scanning
- Network assessment
- Risk reporting
- Regular vulnerability database updates
- Compliance reporting
Best Used For
- Internal security assessments
- Vulnerability management
- Enterprise network security reviews
Coming Up in Part 3
In the final part, we’ll cover:
- WPScan
- SearchSploit
- Wfuzz
- Recon-ng
- NetExec (formerly CrackMapExec)
- LinPEAS
- WinPEAS
- BloodHound
- Final recommendations
- Frequently Asked Questions
- About the Author