HumHub
An intranet and community platform that gives an organization one shared home for profiles, news, files, wiki pages and surveys. Content is grouped into Spaces with their own members and permissions, and optional modules add a calendar, private messaging, LDAP or SAML single sign-on, polls and search.
Companies, public institutions, associations and universities adopt it to keep staff communication and documentation on one system.
Deployed on your own infrastructure, the internal knowledge and user directory stay inside your perimeter, no per-seat licence applies, and the database and files are simple to snapshot and restore.