The Open Web Application Security Project (OWASP) is an online community that produces freely available articles, methodologies, documentation, tools, and technologies related to web application security. It has over 93 active projects led by volunteer community members. Some of the major OWASP projects include the OWASP Top Ten project, the Application Security Verification Standard, the Web Security Testing Guide, and security tools like ZAP, Dependency Check, and DefectDojo.