The Open Worldwide Application Security Project (OWASP) is the largest community for application security, known for the OWASP Top 10, ASVS, Dependency-Check, ZAP, and countless other open-source projects.
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Cybersecurity Marketing Society
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Cybersecurity Marketing Society is a 2,500+ member community for cybersecurity marketing professionals, with chapters, events, and a popular podcast.
ISC2
Alexandria, USA
ISC2 is a global nonprofit with 600,000+ certified members, best known for the CISSP certification. It runs chapters, education, and Security Congress for cybersecurity professionals worldwide.
ISACA
Schaumburg, USA
ISACA is a global professional association for IT governance, risk, audit, and cybersecurity. It runs certifications including CISM, CISA, and CRISC, and has 180,000+ members worldwide.