• OWASP GitHub: https://github.com/OWASP
• OWASP ASVS: https://code.google.com/p/owasp-asvs/
• OWASP ESAPI: https://code.google.com/p/owasp-esapi-java/
• OWASP Cheatsheets: https://www.owasp.org/index.php/Category:Cheatsheets
• OWASP Top 10: https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project

Maven libraries: http://search.maven.org/#search%7Cga%7C1%7Cowasp