Which part of camunda is open source

Hi
I have done some research using camunda platform run and want to use Camunda in production environment. We want to package it and deploy inhouse. I am confused on which part of camunda are open source and what are the benefit we get in paid versions?

You can refer to this topic Differences between Enterprise and Community edition - #8 by Ingo_Richtsmeier

And refer to Camunda Platform Enterprise Edition - Camunda for the difference between the Community and Enterprise versions.