Open-Source Calendar Software

Calendar software helps you plan and manage appointments, resources, and shared time slots.

Typical users include teams and organizations that need to coordinate availability, organize meetings, and keep calendars in sync across devices.

Appointment scheduling software adds online booking of client appointments and rules for available time slots to calendars. Project management places dates within tasks, milestones, and dependencies. Project time tracking records the project hours actually worked, while employee time tracking records attendance and breaks.

Features

Below is an overview of common features of calendar software.

Single and recurring events

Day, week, and month views

Sharing and shared team calendars

Availability display and scheduling coordination

Reminders and notifications

Resource planning for rooms and equipment

Sync across multiple devices

Import and export via iCalendar (ICS)

Products

Below is an overview of popular open-source software in the category «Open-Source Calendar Software». The list is sorted alphabetically.

Well-known proprietary examples include Google Calendar and Microsoft Outlook.

ERPNext

ERPNext combines accounting, quotes, invoices, and time tracking with subscription and contract management in one web application.

  • Accounting
  • Appointment Scheduling
  • Calendar
  • Contracts
  • CRM
  • ERP
  • Invoicing
  • Project Time Tracking

Nextcloud

Nextcloud stores and shares files and syncs them across devices. Teams access them through the browser, desktop, and mobile devices.

  • Calendar
  • File Sync and Sharing

Odoo Community

Odoo Community brings together sales, purchasing, inventory, invoicing, calendar, and time tracking in a modular business suite.

  • Calendar
  • CRM
  • Employee Time Tracking
  • ERP
  • Invoicing
  • Project Time Tracking

SOGo

SOGo combines calendars, contacts and webmail to help teams organize appointments and communication.

  • Calendar

XWiki

XWiki manages company knowledge and public wiki pages with a visual editor, search, versioning, and access rights. An optional paid app adds team calendars.

  • Calendar
  • CMS
  • Knowledge Bases