Is all software in CO-CONNECT open source?

No. All the tools that CO-CONNECT are building are open source such as the tools that the data partners use to convert the data and the tool used by the data team to generate mappings rules from metadata CO-CONNECT have also created our own version of BC|Link that is open source, called HUTCH, and implements the query protocol

The software from BC Platforms is not open source. BC Platforms have made available their query protocol (what defines the queries that can be run).