Self-hosted projects tagged “Calendar”

Self-hostable scheduling software for appointments and bookings with customizable booking pages, availability rules, reminders, and integrations for teams and developers.

MITActively maintained

Alternative to:

Calendly+12

Nextcloud is an open-source content collaboration platform providing file sync & share, groupware (calendar, contacts, mail), real-time office editing, chat and video conferencing.

AGPL-3.0Actively maintained

Alternative to:

Google Drive+19

Monica is an open-source personal CRM to manage contacts, track interactions, set reminders, and keep a private diary about your relationships.

AGPL-3.0Slowing down

Alternative to:

Monica CRM (Hosted)+19

Open-source platform for secure file sync, sharing, collaboration, calendars and external storage with WebDAV/CalDAV/CardDAV support.

AGPL-3.0Actively maintained

Alternative to:

Dropbox+19

Open-source, self-hosted polling tool to find the best date/time with no login required.

AGPL-3.0Actively maintained

Alternative to:

Doodle+9

Lightweight CalDAV/CardDAV server for syncing calendars, to-dos, and contacts with many clients, storing data on the filesystem and supporting auth and TLS.

GPL-3.0Actively maintained

Alternative to:

Google Calendar+8

Open source appointment scheduler for customer bookings, provider management, and Google Calendar sync, deployable on your own PHP/MySQL server.

GPL-3.0Actively maintained

Alternative to:

Calendly+18

Self-hosted personal management web app to organize notes, goals, contacts, passwords, schedules, payments, files, photos, and more in one place.

MITActively maintained

Alternative to:

Evernote+14

Self-hosted travel tracker and trip planner with map-based logs, itineraries, sharing, and travel statistics; SvelteKit frontend and Django/PostGIS backend.

Actively maintained

Alternative to:

Wanderlog+3

Self-hosted media tracker to manage movies, TV shows, anime, manga, video games, and books with history, lists, calendar, imports, and multi-user support.

AGPL-3.0Actively maintained

Alternative to:

Trakt+6

Baïkal is a lightweight CalDAV/CardDAV server with a web admin UI for managing users, calendars, and address books, backed by MySQL or SQLite.

GPL-3.0Actively maintained

Alternative to:

Google Calendar+4

Open-source task and chore manager for individuals and groups featuring natural-language scheduling, assignee rotation, NFC triggers, REST API, and S3-compatible storage.

AGPL-3.0Actively maintained

Alternative to:

Todoist+19

Open source groupware suite providing webmail, calendaring, address books, and shared resources via open standards like IMAP, CalDAV, and CardDAV.

GPL-2.0Actively maintained

Alternative to:

Microsoft Exchange Online+19

Indico is a web-based event management platform for meetings, lectures, workshops, and conferences, with workflows for registration, reviewing, and room booking.

MITActively maintained

Alternative to:

Cvent+14

EteSync (Etebase Server) provides a self-hostable, zero-knowledge, end-to-end encrypted sync backend for calendars, contacts, tasks and notes across devices.

AGPL-3.0Likely dormant

Alternative to:

Google Calendar+7

Open-source, self-hosted tournament system for creating and managing Swiss, single‑elimination and round‑robin tournaments with scheduling, dashboards, team/club management and CSV import.

AGPL-3.0Actively maintained

Alternative to:

Challonge+4

Open-source self-hosted app to manage, track and journal houseplants with locations, tasks, inventory, calendar, reminders, group chat and plant identification.

MITActively maintained

Alternative to:

Planta+2

Open-source, tag-based time tracker that records time spans with tags and provides customizable dashboards, calendar/list views, themes, and Docker deployment.

GPL-3.0Actively maintained

Alternative to:

Toggl Track+19

Open source electronic lab notebook (ELN) for documenting experiments, managing lab inventory, and coordinating equipment booking with granular permissions and auditing.

AGPL-3.0Actively maintained

Alternative to:

LabArchives+3

Self-hosted workout tracking web app for GPX/TCX/FIT activities with maps, stats, heatmaps, equipment tracking, and an API for automated uploads and syncing.

Actively maintained

Alternative to:

Hevy+3

Modern, privacy-focused task manager with kanban, calendar, natural-language dates, recurring tasks, and JSON file storage.

Slowing down

Alternative to:

Todoist+9

Nextcloud Mail is a webmail app that connects to IMAP/SMTP accounts, offering a unified inbox and deep integration with other Nextcloud apps like Contacts and Calendar.

AGPL-3.0Actively maintained

Alternative to:

Microsoft Outlook+11

Open-source task scheduler and calendar app that auto-plans tasks, syncs with external calendars, and provides a modern UI for managing time blocks and workflows.

MITActively maintained

Alternative to:

Google Calendar+13

LibreBooking is an open-source scheduling system for managing resource reservations with calendars, waitlists, quotas, reporting, and role-based access control.

GPL-3.0Actively maintained

Alternative to:

Skedda+11

DavMail is a Java gateway that lets standard clients use IMAP/POP/SMTP, CalDAV, CardDAV, and LDAP with Microsoft Exchange and Microsoft 365 via OWA/EWS.

GPL-2.0Actively maintained

Alternative to:

Proton Mail Bridge

Davis is a sabre/dav-based CalDAV/CardDAV/WebDAV server with a modern Symfony 7 admin dashboard for managing users, calendars, sharing, and address books.

MITActively maintained

Alternative to:

Google Calendar+6

Apache OpenMeetings is a web conferencing and collaboration platform with video meetings, chat, whiteboards, screen sharing, recording, file sharing, and user/room management.

Actively maintained

Alternative to:

Zoom+11

Gibbon is an open source school management system for student information, staff workflows, parent access, planning, and daily school operations in one web platform.

GPL-3.0Actively maintained

Alternative to:

PowerSchool+1

Self-hosted Next.js React CalDAV client for managing VTODO tasks and VEVENT calendars with multi-account, list/Gantt/calendar views and filters.

GPL-3.0Actively maintained

Alternative to:

Google Calendar+10

Lightweight CalDAV/CardDAV server implemented in Python that stores calendars and contacts in a Git-backed hierarchy with history and sync support.

GPL-3.0Actively maintained

Alternative to:

Google Calendar+4