[[Business::calendar]]

ACal: The ACal Project is a Web-based event calendar made for everyone. It was designed to be simple to install and setup. It does not require a database server, and installing is as easy as drag and drop. It can run on almost any ISP's server that has PHP installed.

AWOL: AWOL is an in/out board, similar to something you'd see on the wall of a lobby or desk of a switchboard operator, to keep track of who's in the building, when they'll be back, etc. It's accessable from the Web, so people can mark themselves in or out from their own desk.

Absence: 'absence' is a CGI application designed to help keep track of people in a group. It is intended to do one thing: allow the user to display the plans of all people in a group in a way that makes it easy to see who's present and who's absent. It is not intended for anything else. The resolution is one day. It could easily be adapted do handle reservations for any set of objects, as long as a resolution of a day is acceptable. An example of a possible use is reserving machines/computers in a laboratory.

Active Calendar: "Active Calendar" is a PHP class that generates calendars (month or year view) as HTML tables (XHTML-Valid). It can produce static calendars without any links or calendars with navigation controls, a date picker control, event days and content with event URLs, and linkable days (optionally URL or Javascript). The layout can be configured using CSS, and JavaScript is not required. The supported dates (on systems using a 32-bit signed integer Unix time_t) are: 1902-2037 (Unix) and 1971-2037 (Windows), when using the default PHP native date functions, and 100-3000 and later, when using the ADOdb Date Library.

Agnostos: Agnostos is a simple Web-based tool for managing to do lists. It's designed to prevent the cerebral stack overflow that occurs when you try to keep track of several simultaneous projects by brainpower alone. You can prioritize tasks (optionally by date), and assign them to individuals, workgroups, departments, or any combination of the three. Tasks can be assigned priorities and due dates, and sorted by status, priority, or due date. The current release includes simple reporting facilities (which describe the progress on a particular project over the previous week) and an 'audit trail' for each task (time and date of each change of status and priority priority, or individual, group, or department to which it is assigned).

BORG Calendar: Modified from README.md: 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 similar to that of other PIMs. The Task Tracker goes way beyond todo's and might better be called a project tracking system.

Bennu: Bennu is a software library written in PHP that implements the functionality of the IETF iCalendar 2.0 specification (RFC 2445). Its purpose is to enable applications which have an interest in this format (e.g. calendaring, scheduler and organizer programs) to support iCalendar in an easy, powerful, and extensible way.

CDS Indico: Web application to schedule and organise events, from simple lectures to complex meetings, workshops and conferences with sessions and contributions. Also includes an advanced user delegation mechanism, allow paper reviewing, archival of conference information and electronic proceedings.

CGI Calendar: 'CGI Calendar' is a CGI-based event calendar that does not require an SQL database and can run on any system that has a web server supporting CGI and Perl. It supports unlimited events per day that can be sorted by time and by summary. Events are editable and can be described using HTML. It features month, day, and single event views, password protection, a UI controlled by HTML templates and CSS, and support for multiple calendars with a single installation.

CalDavZAP: CalDavZAP is 100% JavaScript+jQuery CalDAV web client/application. Main features: asynchronous background synchronization, support for RFC compliant vCalendars (version 2.0), support for delegated calendars, support for subscribed calendars, full IANA timezone support, time-range filtering (server support required), localization support (15 languages) and clean user interface.

Calconsole: Calconsole is a calendar and schedule command-line appliction. It is like the standard "cal" utility but with a schedule feature. It works with event data stored in ICS files which are compatible with other calendar applications.

Calendar Lock PEA: Calendar Lock PEA is a program for encrypted management of appointments and tasks with cloud connection to Nextcloud and some other cloud providers.

Cday-php: The CDAY Calendar Almanac displays historical anniversaries such as birthdays and general events. It displays the equivalent date in multiple calendar systems, including Hebrew, Julian, JDNs, Great Underground Empire (Zork), and Shire (Lord of the Rings). Separate command line and Web-based versions are available, along with a free library of thousands of events.

Celebrat: Celebrat is a very easy-to-use, non-interactive, text-mode calendar application. It reads a data file in ASCII format, and prints on stdout a human-language summary of what events will take place up to ten days from now. It also includes a small daemon which announces events that are due by putting a message on every registered terminal, or by integrating the announcement in the bottom line of GNU screen sessions.

Chronos: Chronos is a Web agenda calendar for intranets, (although it can be used from anywhere). It can send reminders by email, and lets you to schedule multi-user events. It is fast and light on resources. The balance between size and speed can be tweaked by tweaking mod_perl and Apache.

Confy: Confy is a program that lets users navigate conference schedules. Events can be listed by day, room or track, and users can see the events' descriptions and other information. Talks can be marked as 'starred' for ease of identifying them at a later time. Confy automatically checks for updates to schedules, which can be added to Confy in a number of formats. Confy uses GTK and libhandy for its graphical user interface, allowing it to be used on a variety of screen sizes.

DAViCal CalDAV Server: DAViCal is a server implementing the CalDAV protocol for shared workgroup calendaring. It uses the PostgreSQL database for backend storage of the calendar data.

Dolibarr ERP CRM: Dolibarr is Free Software software to manage a company (sme, freelancer or large companies) or a foundation. It provides a lot of features to manage your customers, partners, suppliers, proposals, orders, invoices, products, stocks, point of sales, etc.

EXo Platform: eXo Platform is an open-source digital workplace platform. Full-featured and user-centered, the solution enables a variety of use cases around internal communications, employee engagement, knowledge management and digital collaboration.

EZ calendar: eZ calendar is an extension to the eZ publish 2 cms. eZ calendar provides an advanced web based calendar application. Formerly known as eZGroupEventCalendar, the eZ calendar, eZ publish 2 module enables an eZ publish instance to provide a full fledged web calendar to users. eZ calendar supports recurring events, event comments, event group, event type, event category, event priority, event status, event comments, event files, event links, sort events by group, month view, week view, day view, year view, event tooltips, jscalendar date selection, new design templates,

Free Software Foundation!