Introduction:
With cyberattacks on the rise, testing your application’s security is essential. Thankfully, several free tools can help you spot vulnerabilities before attackers do.

1. OWASP ZAP
An open-source scanner from OWASP, great for automated penetration testing.

2. Nikto
A web server scanner that identifies a wide range of vulnerabilities.

3. Wapiti
A Python-based vulnerability scanner that analyzes web applications for flaws.

4. Burp Suite (Community Edition)
Ideal for manual and semi-automated web app security testing.

5. SonarQube (Free version)
Detects vulnerabilities in your code during development.

Conclusion:
These tools are a solid foundation to strengthen your application’s security. Remember: security is a continuous process!