Our main demo server is demo.openboxes.com. That would definitely be the easiest way to check out the software. It’s Just click on the signup link and create your own account (feel free to use a bogus name and email). FYI, I’ll be upgrading it to the 0.8.12 release later this week which contains a bunch of new features described here (OpenBoxes v0.8.12 - Release Notes).
You can also watch tutorial videos (https://openboxes.com/tutorials/) to get an overview of how certain features are supposed to be used.
I’d also be happy to provide my thoughts on whether OpenBoxes would be a good fit if you have specific use cases you want to implement. Just tell me what you’re trying to do and I’ll give you an honest response and provide you with alternatives to check out as well.
Justin