Open Source Java Calendar Software

Ever wanted to get rid of Outlook ? DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP gateway allowing users to use any mail client with Exchange and Office 365, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows

Etar is an open-source material-designed calendar made for everyone.

The standard date and time classes prior to Java SE 8 are poor. By tackling this problem head-on, Joda-Time became the de facto standard date and time library for Java prior to Java SE 8. Note that from Java SE 8 onwards, users are asked to migrate to java.time (JSR-310) - a core part of the JDK which replaces this project. The design allows for multiple calendar systems, while still providing a simple API. The “default” calendar is the ISO8601 standard which is used by many other standards. The Gregorian, Julian, Buddhist, Coptic, Ethiopic and Islamic calendar systems are also included. Supporting classes include time zone, duration, format and parsing. Joda-Time provides a quality replacement for the Java date and time classes. Joda-Time is the de facto standard date and time library for Java prior to Java SE 8. Users are now asked to migrate to java.time (JSR-310).

JDavide (per gli amici JD) è un software gratuito per la gestione dello Studio Legale che aiuta l’avvocato nell’espletamento delle operazioni quotidiane. Funzionalità: pratiche, agenda, formulario, atti, parcellazione, rivalutazione, ecc.

BORG is a calendar and task tracking system written in Java. The calendar provides a nice month view, month-print, email reminders, popup reminders and to do list. The task tracker tracks issues through various states.

The VCS to ICS Calendar Converter allows you to convert VCALENDAR files (for example generated by Nokia nbuexplorer or Microsoft Works) to the newer iCalendar format, used by Android and iOS for example. It allows the parsing of events and todo's.

A Java library for reading and writing iCalendar (*.ics) files.

CentraView - Browser based Enterprise Java (J2EE) Contact Management, Groupware, Collaboration, CRM, SFA, Project Management software. Run locally or as a hosted service. Built on Apache Tomcat, JBoss, MySQL, Linux (Fedora, RedHat and others) & Windows

Periodic Calendar is a GUI application which assists in women menstrual cycles tracking and fertility periods prediction. Periodic Calendar provides support for BBT and sympto-thermal methods which have the highest reliability.

Zimbra is an open source server and client technology for next-generation enterprise messaging and collaboration. Please see www.zimbra.com for the latest news and downloads.

HERO Planner – Unleash Your Scheduling Superpowers Is rostering your kryptonite? Transform chaos into control with HERO Planner, the command center for retail, hospitality, and service teams. This modern desktop app turns managers into scheduling superheroes—no cape required. Your Utility Belt: ✓ Super Speed: Intuitive drag-and-drop & bulk actions for lightning-fast updates. ✓ Compliance Shield: Real-time alerts guard against labour law violations and overtime risks. ✓ X-Ray Vision: Instantly visualize coverage gaps, conflicts, and staff availability. ✓ Universal Export: PDF, CSV, and HTML formats. ✓ Stealth Mode: Sleek Dark Mode & customizable themes. Built on Electron, React & Vite for blazing performance. Whether managing a small squad or a legion of 200+ staff, HERO Planner gives you the tools to save the day. Don't just manage the rota—be the Hero.

openCRX moved to https://github.com/opencrx

An Android calendar app focusing on a good view of a month, because I like the monthly view, and never use weekly view. So do you? Then this might be for you. For Android 4.0 and above. Legacy (Android 2.2+) version also available.

The k5n Desktop Calendar (k5nCal) is a Java-based calendar application that leverages existing standards (iCalendar, WebDAV) to create an open source cross-platform multi-user desktop calendar application.

Organize your activities with the help of this software. BSplanner is a simple, easy to use calendar application designed to lend you a hand when it comes to managing your daily or monthly activities.

Platformunabhängiger Kalender zum Eintragen von Ereignissen mit Erinnerungsfunktion. Beinhaltet alle deutschen Feiertage. Zwischen den Ansichten Jahresansicht, Monatsansicht, Wochenansicht und Tagesansicht kann umgeschaltet werden. Der Kalender kann im Hintergrund laufen und ist personalisierbar. Automatische Erinnerungsfunktion für nahende Ereignisse / Feiertage. Synchronisation über einen FTP-Server möglich.

A small tool to delete old entries in a ICS-Calendar (*.ics) file. Simply choose a *.ics-file, choose a date until you want to delete the old entries and click on the delete button.

Application for managing calendars. The main focus is a print function for printing month oder weekly overviews that can be pinned on a wall etc. Many sources of terms will be available, for example Google Calendar (already tested!), iCalendar or other f

A multiuser Diary Management System that will enable staff in organisations to set/update/view meetings and appointments. The system will operate via a central server, but clients will able to function offline. It will support Mac OSX/Windows/*nix

Open-Xchange collaboration suite. Visit http://www.open-xchange.com/header/community_area.html to get more information about getting support and reporting bugs.

It allows you to manage project timings using tasks, and is always available on your system tray to be able to easily change your task. You can make real timing report of your project at all time with no effort.

Tpl makes it easy to serialize your C data using just a handful of API functions. The data is stored in its native binary form for maximum efficiency. C, Perl and XML supported. Data is portable across CPU types and OS's from Unix to Mac to Windows.

Amnesia is a reminder that allow to define alarms, stickers (post-its) for reminding you some important stuff, and notes about whatever you want. Alarms can be programmed to appear at a given time, stickers can be placed on desktop to view it anytime.

ASRemind is a desktop reminder application that links to a user's Google Calendar's entries and reminds them of upcoming activities. It also allows a user to enter notes on the various activities that a user is doing.

AchievePro is a project management software application that integrates scheduling and ticket based task management. It is implemented as a web service, with a client for both the web and iPhone.