@Malcolm_Wilson we also have with this in the past store.wso2.com. They all have their merits. The central fact is that most business that use erpnext are not going to invest in building out a mulesoft, wso2, or centio infrastructure.
I was excited about these dsync.com. They are not open source, but they could help the community grow by giving companies an option, It was an instance like this that stopped me from joining the foundation. I had talked to the guy, and they ended the connector because of how the community seemed opposed to it. Im my opinion this hurt the community and gives a stigma that if you are willing to be purely opensource, then we wont want to work with them. The main reason that I posted it they provide both.