how to find out the custom module

Hi,

My Sugarcrm has been customized a lot, I just wonder how can I find out which module is custom build and which one is come with Sugarcrm?
I have check Admin->Studio. From the left side tree list, I can see all module are list here. I can see some of the module has a asterisk beside it, but it doesn't seem it's represent custom build module.


Thank you.
Manson

SugarCRM Version 10.0.3 (Build 192 P) (Q2 2020)