Is there a trial for CommBox Manage?

There isn't a trial for CommBox Manage as it works off a crediting system. You can however register for an account, and have a look around the back end, create and play around with all the functionality - really get a feel for the user interface. 

Then if you like CommBox manage you can either buy a CommBox panel that comes with 2555 credits which work out to be: 1 credit = 1 device for 1 day, so they can be divided up among any number of devices. 

Be aware this will shorten the time period that the credits last for as they are divided amongst multiple screens.