Confluence

Confluence is an open and shared workspace

Snippet from Wikipedia: Confluence (software)

Confluence is a collaboration software program developed and published by Australian software company Atlassian. Atlassian wrote Confluence in the Java programming language and first published it in 2004. Confluence Standalone comes with a built-in Tomcat web server and hsql database, and also supports other databases.

The company markets Confluence as enterprise software, licensed as either on-premises software or software as a service running on AWS.