Lightning Calendar Organize your schedule and events in a calendar fully integrated with Thunderbird or Seamonkey email. . Free Open Source Mac Windows Linux Thunderbird SeaMonkey CalDAV CardDAV Add a feature 157 Like
Rainlendar Rainlendar is a feature rich calendar application that is easy to use and doesn't take much space on your desktop. The application is platform independent so you can... Freemium Mac OS X Windows Linux Customizable Sync with Fantastical Sync with Google Calendar Multiple languages Add a feature 95 Like
Kolab Community Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite. Free Open Source Linux Web Self-Hosted CalDAV CardDAV Real time collaboration Support for WebDAV Add a feature 36 Like
Kontact Kontact is the integrated Personal Information Manager of KDE. Kontact suite unites mature and proven KDE PIM applications under one roof. Thanks to the powerful... Free Open Source Windows Linux Convert Email to Task Add a feature 25 Like
MineTime MineTime is a free, modern and multi-platform calendar application. It connects to several calendar providers (including Google Calendar, Microsoft Exchange and... Free Mac Windows Linux Calendar integration Google Calendar integration Sync with Google Calendar Sync Calendars Add a feature 5 Like
fruux Free service that takes care of your contacts, calendars and more so you don't have to. . Freemium $ $ $ Mac OS X Windows Linux Web Android ... iPhone Blackberry Windows Phone iPad Blackberry 10 Sailfish OS CalDAV CardDAV Sync Contacts Sync Calendars ... Team Collaboration Add a feature 18 Like
BORG Calendar BORG is a combination calendar and task tracking system. The calendar supports all sorts of appointments and also a simple todo list. The calendar functionality is... Free Open Source Windows Linux No features added Add a feature 7 Like
Kontact - KOrganizer KOrganizer is the calendar and scheduling component of Kontact, the integrated personal information manager from KDE. Free Open Source Linux KDE No features added Add a feature 13 Like
Maya Maya is a slim, lightweight, GCal-syncing GTK+ Calendar application written in Vala, specifically for elementary OS . Also looks and works great on other GTK+ desktops. Free Open Source Linux Lightweight Add a feature 7 Like
California California is a calendar built for GNOME 3. It allows you to view and manage your online calendars with a simple and modern interface. Free Open Source Linux No features added Add a feature 6 Like
Woelkli woelkli is a service that provides secure cloud storage hosted in Switzerland. Save, view, edit and share your files from anywhere in the world, from any device Freemium Mac OS X Windows Linux Web Android ... iPhone No features added Add a feature 9 Like
GNOME Calendar GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME desktop. By reusing the components which the GNOME desktop is build on... Free Open Source Linux Sync with Google Calendar CalDAV Standalone Add a feature 3 Like
todoyu todoyu is an extendable, web-based, open source project and task management system. It is geared to the needs of SMEs, tailored to project-related work and suitable for... Free Open Source Mac OS X Windows Linux Web Real time collaboration Add a feature 18 Like Discontinued Message on homepage reads: We are no longer maintaining todoyu. So we closed todoyu.com, doc.todoyu.com and all other services connected to the product todoyu on the 31.12.2016. You still can access and download the source code here: https://sourceforge.net/directory/os:windows/?q=todoyu
Remind A sophisticated calendar and alarm program. It includes the following features: A sophisticated scripting language and intelligent handling of exceptions and holidays.... Free Open Source Linux Command line interface Add a feature 1 Like A free and open source, UNIXy alternative that works from the terminal. Guest • May 2016 Disagree Agree
Ominder Keep track of all your Events with free SMS and Email notifications. Store and organize your Events and To-do on Ominder and never forget them again. Events include... Free Mac OS X Windows Linux Android Windows Phone SMS Reminders Add a feature 5 Like
