How to communicate in a multi-organization spanning project
Establish a wiki (such as Confluence, DokuWiki, etc).
Establish a chat/communications channel (such as through Slack or Mattermost).
Share some code repositories (such as through GitLab, Bitbucket, GitHub).
Share some binary repositories (such as through Artifactory, Nexus, Pulp).
Occasionally send out a &quot;newsletter&quot; email that showcases what your team are trying to accomplish.