PortKnox - PortKnox is a free OwnCloud provider.
Cisco Umbrella - Cisco Umbrella is a cloud security platform that provides the first line of defense against threats on the internet.
nxCloud - nxCloud is a commercial OwnCloud provider
WebTitan - WebTitan is an advanced DNS based web content filter and web security layer that blocks malware, ransomware and phishing attempts as well as providing web content control. Cloud and gateway versions available.
OwnCube - OwnCube is an OwnCloud provider.
DNSFilter - DNSFilter offers DNS-Based Content Filtering & Threat Protection.