sabre/dav is the most popular WebDAV framework for PHP. Use it to create WebDAV, CalDAV and CardDAV servers.
It supports WebDAV, CalDAV, CardDAV, vCard, jCard, iCalendar 2.0, jCal, current-user-principa,l Extended MKCOL, WebDAV-sync, CardDAV directories, CalDAV delegation, CalDAV sharing.

sabre/dav - CalDAV, CardDAV and WebDAV framework for PHP

FullCalendar is a full-sized drag & drop event calendar. It generates real React virtual DOM nodes so you can leverage Fiber, React's highly optimized rendering engine. It has support for React, Vue, Angular and Javascript.

Fullcalendar - Full-sized drag & drop event calendar

Radicale is a free and open-source CalDAV and CardDAV server. It shares calendars and contact lists through CalDAV, CardDAV and HTTP, Supports events, todos, journal entries and business cards. It works out-of-the-box, no complicated setup or configuration required. It stores all data on the file system in a simple folder structure.

Radicale - A simple CalDAV (calendar) and CardDAV (contact) server

Joda-Time provides a quality replacement for the Java date and time classes. The standard date and time classes prior to Java SE 8 are poor. By tackling this problem head-on, Joda-Time has become the de facto standard date and time library for Java. The design allows for multiple calendar systems, while still providing a simple API. The 'default' calendar is the ISO8601 standard which is used by XML. The Gregorian, Julian, Buddhist, Coptic, Ethiopic and Islamic systems are also included.

Joda Time - Java Date and Time API

This jQuery plugin leverages Jon Nylander's jstimezonedetect (based on work by Josh Fraser). It could able to set the current timezone value by calling .val on the selector. This generally assumes the selector is an input (text or hidden). It is also retrieves current browser timezone. 

jQuery Detect TimeZone Plugin

Kopano Core provides the foundation for groupware messaging enabling clients such as Kopano WebApp, Kopano DeskApp, mobile and sync clients. With its modular architecture, Kopano Core enables the possibility for a variety of setup scenarios, scalable from a very low-powered system to a multi-datacenter setup providing messaging capabilities to tens of thousands of users.
 
Kopano Core provides all traditional groupware functionality with e-mail, advanced calendaring, contacts, tasks and notes. With full support for ACLs, public folders, delegation, enterprise search and much more, Kopano Core is perfectly suited for usage as messaging platform with professional needs in communication. The native implementation of MAPI allows conversion-less interoperability providing its rich feature-set to a broad range of clients, including mobile integration.

Kopano Core provides the foundation for groupware messaging enabling clients such as Kopano WebApp, Kopano DeskApp, mobile and sync clients. With its modular architecture, Kopano Core enables the possibility for a variety of setup scenarios, scalable from a very low-powered system to a multi-datacenter setup providing messaging capabilities to tens of thousands of users.

Kopano - Collaboration made easy

Leantime is a lean open source project management system for startups and innovators written in PHP, Javascript with MySQL. It has support of Kanban board, Gantt charts, task management, Timesheet management, Idea boards, Project dashboards, Roles management, Integrations with Mattermost, Slack & Zulip and lot more.

Leantime - Lean project management system for innovators

OpenPaaS is your next collaboration platform, for enterprises & organizations. It provides your own private and digital workplace. Its feature include AI powered emails, Secure file sharing, Video conferencing, Office suite, Calendar, Community, Team channels. It is good alternative to MS365 and Google Suite. 



Open PaaS - Enterprise Social Network

Time4J is thought as a complete and high-end replacement for old java classes around java.util.Date, java.util.Calendar and java.text.SimpleDateFormat. This project is also intended as first-class alternative to the popular libraries JodaTime and its successor JSR-310 (Threeten) since the target audience of Time4J will not only be business Java developers, but also developers with a more scientific background (for example extended time scale support including leap seconds or historically accurate dates).
 
Although the new JSR-310 (built in Java 8) is certainly a very useful library for many business developers it also has some severe and intentional limitations. Time4J intends to fill all gaps in the future so justifying its co-existence. The interoperability with java.time-package is supported by easily available conversion methods.

Time4J is thought as a complete and high-end replacement for old java classes around java.util.Date, java.util.Calendar and java.text.SimpleDateFormat. This project is also intended as first-class alternative to the popular libraries JodaTime and its successor JSR-310 (Threeten) since the target audience of Time4J will not only be business Java developers, but also developers with a more scientific background (for example extended time scale support including leap seconds or historically accurate dates).

Time4J - Advanced date, time and interval library for Java

Kolab is a secure, scalable and reliable groupware server. Kolab helps to manage Email, Calendar, Contacts. It comes with a File Cloud and an advanced Task Management Module. 

Kolab - Groupware Server

PrettyTime is an OpenSource time formatting library. Completely customizable, it creates human readable, relative timestamps like those seen on Digg, Twitter, and Facebook. It has support for over 30 languages.

PrettyTime - Social Style Date and Time Formatting for Java

WebTop is a Web2.0 application platform. It provides WebTop Services as the development framework and WebTop Groupware as a full featured bundle of services that form an Enteprise Cloud Collaboration solution with Mail, Calendar, Contacts and more. 
 
WebTop Services consists of a rich Web2.0 developement framework based on ExtJS/Java, with prebuilt key functionalities to allow for a quick and easy implementation and deployment of applications in the form of services available inside a Web Desktop. Its key feature include authentication, profiling, access control to services, layout, session management, server events polling, internationalization, themes customization and more.

WebTop is a Web2.0 application platform. It provides WebTop Services as the development framework and WebTop Groupware as a full featured bundle of services that form an Enteprise Cloud Collaboration solution with Mail, Calendar, Contacts and more. 


WebTop - Enterprise Collaboration suite

SOGo is a very fast and scalable modern collaboration suite (groupware). It offers calendaring, address book management, and a full-featured Webmail client along with resource sharing and permission handling. It also makes use of documented standards (IMAP, CalDAV, CardDAV, etc.) and thereby provides native connectivity (without plugins) to many clients such as Microsoft Outlook, Apple iCal, the iPhone, Mozilla Lightning, and a plethora of mobile devices.

SOGo - Fast and scalable modern collaboration suite (groupware)

Backport of functionality based on JSR-310 to JDK1.7. This is NOT an implementation of JSR-310. Instead, this is a simple backport intended to allow users to quickly use the JSR-310 API on Java SE 6 and 7. The backport should be referred to using the "ThreeTen" name.

ThreeTen - Backport of DateTime functionality based on JSR-310 to Java SE 6 and 7

Kalendar is an Elementary Compose Calendar for Android.  With Compose getting the attention, it was about time to have its own Calendar. Kalendar is all about it with the customization and design. 

Kalendar - An Elementary Compose Calendar

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