Linchpin - I am looking for an extranet for communication with clients

I am looking for an extranet in order to also communicate with clients. Do you have any recommendations for me?

Please take a look at our intranet solution Linchpin which lots of clients are using as an extranet:

Addionally we offer an add-on which includes extranet use cases:

Base for both is Atlassian’s Confuence:,+Intranet,+Social+Collaboration