OPC UA Client is a free client tool that supports the main OPC Unified Architecture information models. These models are Data Access, Alarms & Conditions, and Historical Data Access. In fact, it offers the capability to:
Discover local and remote OPC UA servers,
Establish secure communication channels,
Browse the address space of any OPC UA compliant server,
Monitor real-time data and alarms & conditions,
Explore and update history data.
Moreover, this OPC UA explorer allows you to generate its self-signed Application Instance Certificate in order to provide application level security and secure the connections with OPC UA servers.