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Browse free open source Calendar software and projects for Windows below. Use the toggles on the left to filter open source Calendar software by OS, license, language, programming language, and project status.

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  • 1
    DavMail POP/IMAP/SMTP/Caldav to Exchange
    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
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    Downloads: 893 This Week
    Last Update:
    See Project
  • 2
    Outlook CalDav Synchronizer

    Outlook CalDav Synchronizer

    Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server

    Free Outlook Plugin, which synchronizes events, tasks and contacts between Outlook and Google, SOGo, NextCloud, Horde or any other CalDAV or CardDAV server. Supported Outlook versions are 2021, 2019, 2016, 2013, 2010 and 2007 and Office 365 for Desktop. This project was initially developed as a master thesis project at the University of Applied Sciences Technikum Wien, Software Engineering Degree program. Outlook CalDav Synchronizer is Free and Open-Source Software (FOSS), still you can support the project by donating on Sourceforge or directly within the About dialog of our Plugin. Contact us for enterprise support at https://caldavsynchronizer.org/enterprise/contact
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    Downloads: 827 This Week
    Last Update:
    See Project
  • 3
    Zentyal, Linux Small Business Server

    Zentyal, Linux Small Business Server

    Zentyal is a Linux Small Business Server

    Zentyal Server is an easy to use and affordable Linux server, specially designed to meet the needs of small and medium businesses Thanks to Zentyal's Samba integration, Zentyal provides native compatibility with Microsoft Active Directory, allowing you to join Microsoft clients to a domain and manage them easily. Zentyal Server incorporates all the network services required in a small and medium business environment: * Directory & Domain Server with native compatibility with Microsoft Active Directory * Mail Server with ActiveSync and webmail * Gateway with firewall and proxy * Infrastructure Server with DNS/DHCP server, Certification Authority and Virtual Private Networks For more information and download, please access the project's home page.
    Downloads: 24 This Week
    Last Update:
    See Project
  • 4
    FMA is a SMS Manager, Mobile Phone Monitor, Remote Control Agent, Phonebook Manager, Organizer, Fun and much more; whatever you want it to be, it is whatever a mobile phone should have :-) (Currently based on Sony Ericsson features set).
    Downloads: 11 This Week
    Last Update:
    See Project
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  • 5
    openCRX - Enterprise Class CRM

    openCRX - Enterprise Class CRM

    professional CRM and groupware service, ready for the cloud

    openCRX moved to https://github.com/opencrx
    Downloads: 7 This Week
    Last Update:
    See Project
  • 6
    IGSuite - Integrated Groupware Suite

    IGSuite - Integrated Groupware Suite

    IGSuite is a web-ajax-based Integrated Groupware Suite

    IGSuite is a web-based Integrated Groupware Suite oriented to be a CRM solution. In the Suite you can find: IGWebMail, IGCalendar, IGContacts, IGArchive, IGWiki, IGTodo, IGChat, Projects, IGFax an HylaFax client, IGFileManager, IGMsg and many other.
    Downloads: 6 This Week
    Last Update:
    See Project
  • 7
    Lotus Notes to Google Calendar tool

    Lotus Notes to Google Calendar tool

    One-way synchronization from Lotus Notes Calendar to Google Calendar

    This is a one-way sync program that will sync your Lotus Notes Calendar to your Google Calendar. No installation is required. Includes many options such as automatic syncing at specified intervals. *Important Privacy Information: https://sourceforge.net/p/lntogoogle/wiki/PrivacyPolicy/ *** Information Update, September 2020: *** Recent issues with Google Synchronization should be fixed with version 1.9.2 which is available for download, now. For typical installation pitfalls, see: https://sourceforge.net/p/lntogoogle/wiki/InstallationPitfalls/ The project was not maintained since its last update in February 2015. However, since I've tracked more than 15.000 Downloads over the last 5 years and still more than 1 million Calendar API-Calls per day, I assume that the tool is still very much in use. So I decided to go back to work. More info: https://sourceforge.net/p/lntogoogle/wiki/Home/ Donations appreciated
    Downloads: 1 This Week
    Last Update:
    See Project
  • 8
    An Open source Microsoft Outlook ( MAPI ) Connector. This project provides free software that enables Microsoft Outlook users to connection to various Microsoft Exchange Groupware server alternatives.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 9
    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
    Downloads: 1 This Week
    Last Update:
    See Project
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  • 10
    FreeMiCal allows the bulk export of MS Outlook appointment items to RFC 2445 conformant iCal format. .NET 2.0 or greater and Outlook 2003 or 2007 Interop Services required.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 11
    IlohaMail is a PHP based lightweight full featured multilingual webmail program with IMAP and POP3 support. IlohaMail also includes a full-featured contacts manager, bookmarks manager, and scheduler.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 12
    OpenJean is a cross-platform, extensible, personal information manager. It includes: file manager, RSS aggregator, calendar and appointments diary, mailer, image manager, multimedia manager, favorites, notes, tasks, anniversaries, topics and address book
    Downloads: 1 This Week
    Last Update:
    See Project
  • 13
    ChopeCREW
    Air France planning importation, processing, and exportation
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    The Crosswise project is a web-based community event calendar that adds modular data analysis and visualization, and communication methods, to provide community organizations with a powerful event planning, collaboration and analysis tool.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    The BlackBox - austrians oldest, still existing online community is about to develope a new collaboration-ware.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    MOVED: https://github.com/dcbriccetti/dbschools
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    Electronic Activities Board is a web-based calendar and an event management system for both personal and corporate use.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    The lightning-exchange-provider addon allows you to use Microsoft Exchange calendars in Thunderbird, via Exchange’s web services. The addon works on Thunderbird 3.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Extranator is a PHP application used to create extranet/intranet solution.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    Resources for creating personal or family websites including modules for open source content management systems (CMS) such as phpWebsite.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    A simple application to use Google calendar and email conveniently. It makes it easier to access Google services presenting them in a window in seperate tabs, also automating the logon by saving your user name (and password).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    GAIM Tracker is a plugin which integrates Mozilla Sunbird calendar with GAIM and automatically updates your status based on calendar entries and agenda items.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    J2ME application that offers two-way synchronization between Google Calendar and the built-in calendar of a mobile phone (cell phone), BlackBerry or PDA
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Helper is an integrated PIM and social networking (blog, RSS, foaf, etc) client. Allows to store, annotate and navigate information uniformly by means of folders, tags and categories. Based on OWL, Eclipse RCP and open standards (Dublin Core, foaf, etc).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    WebDAV-interface to MS-Exchange-Server for contacts and appointments written in Java 5. Requires only some Apache common*.jars and log4j. XML parsing done through javax.xml.* classes. "mv.string" supported, LDAP user authentication included.
    Downloads: 0 This Week
    Last Update:
    See Project
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