20 open-source apps
Best self-hosted Groupware & Calendars apps
Ranked by GitHub stars
All 20 Groupware & Calendars apps
Nextcloud
nextcloud/server
Access and share your files, calendars, contacts, mail and more from any device, on your terms.
Active · last commit Oct 26, 2026
FeaturedFile Sync & StoragePHPSeafile
haiwen/seafile
File hosting and sharing solution primary for teams and organizations.
Active · last commit Oct 16, 2026
File Sync & StorageCColanode
colanode/colanode
Collaboration suite with real-time messaging, rich text pages, file management, and dynamic databases - built for offline work (alternative to Slack, Notion).
Maintained · last commit Apr 3, 2026
Groupware & CalendarsTypeScriptDockerRadicale
Kozea/Radicale
Simple calendar and contact server with extremely low administrative overhead.
Active · last commit Oct 25, 2026
Groupware & CalendarsPythonBaïkal
sabre-io/Baikal
Lightweight CalDAV and CardDAV server based on sabre/dav.
Active · last commit Oct 19, 2026
Groupware & CalendarsPHPSOGo
Alinto/sogo
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.
Active · last commit Oct 22, 2026
Groupware & CalendarsObjective-CSync-in
Sync-in/server
File storage, syncing, sharing, and collaboration with real-time editing, permission management, and desktop/CLI clients.
Active · last commit Oct 25, 2026
File Sync & StorageTypeScriptDockerSabreDAV
sabre-io/dav
Open source CardDAV, CalDAV, and WebDAV framework and server.
Active · last commit Oct 1, 2026
Groupware & CalendarsPHPKeeper.sh
ridafkih/keeper.sh
Calendar syncing tool that pulls and pushes events between calendar sources and destinations via iCal/ICS or OAuth, with support for anonymized busy/free events.
Active · last commit Oct 22, 2026
Groupware & CalendarsTypeScriptDockerbewCloud
bewcloud/bewcloud
File sharing + sync, notes, and photos (alternative to Nextcloud and ownCloud's RSS reader).
Active · last commit Oct 18, 2026
File Sync & StorageTypeScriptDockerDavMail
mguessan/davmail
POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.
Active · last commit Oct 25, 2026
Email ServersJavaDavis
tchapi/davis
A simple, dockerizable and fully translatable admin interface for sabre/dav based on Symfony 5 and Bootstrap 4, largely inspired by Baïkal.
Active · last commit Oct 25, 2026
Groupware & CalendarsPHPOpenmeetings
apache/openmeetings
Video conferencing, instant messaging, whiteboard, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming.
Active · last commit Oct 26, 2026
Groupware & CalendarsJavaManage My Damn Life
intri-in/manage-my-damn-life-nextjs
Manage my Damn Life (MMDL) is a self-hosted front end for managing your CalDAV tasks and calendars.
Active · last commit Sep 13, 2026
Groupware & CalendarsJavaScriptDockerXandikos
jelmer/xandikos
Open source CardDAV and CalDAV server with minimal administrative overhead, backed by a Git repository.
Active · last commit Oct 21, 2026
Groupware & CalendarsPythonegroupware
EGroupware/egroupware
Software suite including calendars, address books, notepad, project management tools, client relationship management tools (CRM), knowledge management tools, a wiki and a CMS.
Active · last commit Oct 24, 2026
Groupware & CalendarsPHPGroup Office
Intermesh/groupoffice
Enterprise CRM and groupware tool. Share projects, calendars, files and e-mail online with co-workers and clients.
Active · last commit Oct 26, 2026
Groupware & CalendarsPHPTracim
tracim/tracim
Collaborative Platform for team collaboration: file,threads,notes,agenda,etc.
Active · last commit Oct 9, 2026
Groupware & CalendarsPythondayGLANCE
krelltunez/dayGLANCE
Day planner with drag-and-drop time blocking, inbox, recurring tasks, habits, routines, goals, projects and Pomodoro focus mode, plus iCal and CalDAV calendar sync. Data stays in the browser, with…
Active · last commit Oct 26, 2026
Task ManagementJavaScriptDockerTine
tine-groupware/tine
Software for digital collaboration in companies and organizations. From powerful groupware functionalities to clever add-ons, tine combines everything to make daily team collaboration easier.
Active · last commit Oct 24, 2026
Groupware & CalendarsHTMLDocker
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Related categories
What is the best self-hosted app for groupware & calendars?
By GitHub stars, Nextcloud is the most popular self-hosted app for groupware & calendars with 37,298 stars, followed by Seafile and Colanode. The best fit depends on your needs, so compare Docker support, license and recent activity on each app page.
Are these Groupware & Calendars apps free?
Yes. All 20 apps in this category are open source and free to run on your own server. A few also offer a paid hosted plan or enterprise add-ons, but self-hosting the open-source edition costs nothing beyond your hardware.
How do I install a self-hosted Groupware & Calendars app?
7 of the 20 apps here ship a Docker image, which is the easiest route: rent a small VPS or use a home server, install Docker, and start the app with its Docker Compose file. Apps without an image list their native install steps in the README.
Which Groupware & Calendars apps are most actively developed?
Measured by commits in the last twelve months, the most active projects are Nextcloud (8,041 commits), dayGLANCE (6,595 commits) and Tine (4,232 commits). Active development usually means faster bug fixes and security patches.