PortKnox - PortKnox is a free OwnCloud provider.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
nxCloud - nxCloud is a commercial OwnCloud provider
Forcepoint Web Security Suite - Internet Security
OwnCube - OwnCube is an OwnCloud provider.
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...