Is there a way to set stuff up where customers can add their own content or not? Like, a calendar feature? Say I am doing something with dogs...can I set it up where they can add their dogs' names, etc?

Because the software focusses on Content Management and distributing your content to end-users, there are no built in features of for this. However, you could create a mobile HTML page to embed in your app to collect data. This screen / form, would need to connect to your own backend. Our next release (v1.5) allows for much easier customization and supports a Plug-In design. This mean exending it to have additional features will be much easier. This means you could easily create (if you undersand the source-code) or hire someone to create (if you don't) screens for you then add them to your project. Hope this helps

so for example we have another application source code we can import it to buzztouch and edit it?

I guess that would work? I'm thinking the skill level required to import another application source code into buzztouch and get it to work would not be worth the effort? If you have the skill do do that, you probably have the skill to create an app from scratch, without buzztouch?