Tine 2.0 is a Web-based groupware solution that focuses on usability and correctness. To achieve these goals, the project uses usability experts and covers most of the code by unit tests. It contains support for contacts, tasks, calendar, email, CRM, VoIP integration, a time tracker, ActiveSync, and a flexible rights management system.
WallCalendar is a set of LaTeX wall calendar templates and utilities for managing them. Users can customize templates or create their own. It includes a template that produces Interior and Covers, which are ready to be uploaded to lulu.com for printing on demand. It also contains a calendar Web site example (generated using the txt2site utility) that integrates with a paper calendar via QR codes.
Wyrd is a curses front-end for Remind, a powerful calendar and alarm application. The display features a scrollable time table suitable for visualizing your schedule at a glance. Wyrd integrates with an external editor of your choice to make editing of reminder files more efficient, and provides hotkeys to quickly access the most common Remind options. Other features include extensive configurability, Mutt-like interface design, and minimal resource requirements.
Bedework is an open-source enterprise calendar system that supports public, personal, and group calendaring. It is designed to conform to current calendaring standards (iCalendar RFC 2445 iCal, iTIP: RFC 2446, CalDAV: RFC 4791, VVENUE) with a goal of attaining strong interoperability between other calendaring systems and clients (Mozilla Lightning, Apple iCal). Bedework is built with an emphasis on higher education, though it is used by many commercial enterprises. You may choose to deploy Bedework for public events calendaring, personal calendaring and scheduling, or both. It is suitable for embedding in other applications or in portals and has been deployed across a wide range of environments.
Dateutils are a bunch of tools that revolve around fiddling with dates and times in the command line, with a strong focus on use cases that arise when dealing with large amounts of financial data. Their target market is shell scripts that need date calculations or calendar conversions, and as such they are highly pipe-able and modeled after their well-known cousins (e.g. dtest vs. test, or dgrep vs. grep).
etmTk is an event and task manager. In contrast to most calendar/todo applications, creating items (events, tasks, and so forth) in etm does not require filling out fields in a form. Instead, items are created as free-form text entries using a simple, intuitive format and stored in plain text files. Both a graphical user interface based on Tkinter and a command line interface are provided.