For OPC UA Server application vendors: we take care of installing and running your demo OPC UA Servers at opcuaserver.com, for free.
One-Way Automation offers up to one year free hosting of demo/simulation version of your OPC UA Server at opcuaserver.com. Your potential customers can connect to them and evaluate from any OPC UA Client application which have access to the Internet. Or they can connect even without installing of any client side software from our OPC UA Online Client, which has demo installation at https://uaclient.com ready to use from any browser.