Openmeetings

Email, calendar, collaboration server with Web interface and lots of integrations.

Access and share your files, calendars, contacts, mail and more from any device, on your terms.

SOGo offers multiple ways to access the calendaring and messaging data. CalDAV, CardDAV, GroupDAV, as well as ActiveSync, including native Outlook compatibility and Web interface.

File storage, syncing, sharing, and collaboration with real-time editing, permission management, and desktop/CLI clients.

Software suite including calendars, address books, notepad, project management tools, client relationship management tools (CRM), knowledge management tools, a wiki and a CMS.

Enterprise CRM and groupware tool. Share projects, calendars, files and e-mail online with co-workers and clients.