One other really awesome open source project is called Zammad. It is a source model similar to N8N for support and ticketing similar to ZenDesk, it’s very good looking, powerful, and a great platform overall
It features flexible data models, SMS, O365 integrations, and a ton more. It is a very powerful platform and worthwhile to work on!
Oh, they are ALSO out of Berlin You guys may be able to meet up