Open source solution or not if not which part are open

I need to know whether builder and add on 100% are open source.We would like to invest and bring my 12 people as community on Angular solution to develop new modules and add one.
If its not 100% open source which parts are close.I need to get more information in detail

Thanks,
Mariah

Hi @Mariah2000!

All of our self-installable SDKs (including Angular) and plugins that integrate with other parties are open source, but the Builder editor is closed source.