Browse free open source Calendar software and projects below. Use the toggles on the left to filter open source Calendar software by OS, license, language, programming language, and project status.
IGSuite is a web-ajax-based Integrated Groupware Suite
Take your office and CRM into the cloud!
private digital diary & note taking appliaciton
Time-Tracking for companies and teams with up to 250+ users
Free, open-source Human Capital Management system
An enterprise-class CRM and more!
Prayer Times for iPhone and Android built-in Calendar
Android calendar app focusing on a good view of a month.
Project productivity & cost estimations tool which creates Gantt Chart
WeekToDo is a Free and Open Source Minimalist Weekly Planner and To Do
Vehicle rental management for SME operators
Planning calendar for holy services
A software for the management of a permaculture oriented garden.
Zentyal is a Linux Small Business Server
professional CRM and groupware service, ready for the cloud
Tool to remind you to upcoming birthdays and events.