OpenCloud is a production-ready Open Source "Drive" solution for storing and sharing files, and we are adding a Groupware stack to all that.

We'd like to present our concept (especially regarding the integration of the other services in our stack, namely OpenCloud Drive and OpenTalk) as well as what we have so far in terms of our implementation, which extensively uses JMAP in its middleware, in combination with a Stalwart backend that does a lot of the heavy lifting.

The whole stack is Open Source, implemented in Go and TypeScript.