OWASP is a non-profit organization dedicated to enabling organizations to develop secure web applications. It provides free tools, documents, forums, and chapters to improve application security through a community approach focusing on people, process, and technology. Membership levels include individual supporters for $50/year and organization supporters for $5,000/year, with benefits like conference discounts and advertising opportunities. OWASP's core values are openness, innovation, global participation, and integrity.