We improve the security of apps with community-led open source projects, 260 local chapters, and tens of thousands of members worldwide. Famous for OWASP Top 10 OWASP is a 501(c)(3) worldwide not-for-profit charitable organization focused on improving the security of software. No more insecure software. As the world’s largest non-profit organisation concerned with software security, OWASP: Supports the building of impactful projects; Develops & nurtures communities through events and chapter meetings worldwide; and Provides educational publications & resources In order to enable developers to write better software, and security professionals to make the world’s software more secure.