BORG is a calendar and task tracking system written entirely in Java. The calendar is an appointment organizer that provides a nice month view, month printing, email reminders, popup reminders, and a to do list. The task tracker tracks issues and tasks through various user-defined states.
Taru is appointment scheduler that was designed for use within a university for scheduling demo times between course assistants and students. It includes support for calendar synchronization with iCal and Google. Taru means "to be sufficient, to be enough" in Japanese and "myth" in Finnish.
OpenPSA is a Web application designed specifically to meet the needs of Web agencies and consultants. It aims to be a one-stop solution for the management of typical agency business processes, such as project management and time tracking, invoicing and document management, and group calendars. It also includes CRM features such as sales force automation and direct marketing, and is extendable via the builtin component framework.
ApPHP Medical Appointment is an online doctor and therapist appointment system for medical clinics. It makes it possible for patients to book appointments using a Web interface, and for clinic administrators to approve or reject appointments. Visitors can search for doctors by specialty or name, and view doctor availability.
Interleave is a Web-enabled business process automation application. It enables you to model your business process like purchasing, project management, and contract management and make it available online. It's meant to replace processes which currently rely on paper, email, or spreadsheets and it has a very good workflow engine. You can create invoices, export to RTF and PDF based on templates, export to MS Excel, interpret incoming email, and publish your data to the Web.
TimeTrex is a complete Web-based payroll and time management suite that offers employee scheduling, time and attendance (timeclock, timesheet/timecard), job costing, invoicing, and payroll in a single package. Employees can use Web browsers or timeclocks to track their time and attendance, check their own timesheet for missed punches, and respond to flagged timesheet errors. Payroll administrators can quickly generate paystubs and process payroll based off timesheet information or export timesheet data to other applications.
When is an extremely simple personal calendar program, aimed at the Unix geek who wants something minimalistic. It can keep track of things you need to do on particular dates. It's a very short and simple program, so you can easily tinker with it yourself. It doesn't depend on any libraries, so it's easy to install. You should be able to install it on any system where Perl is available, even if you don't have privileges for installing libraries. Its file format is a simple text file, which you can edit in your favorite editor.
absence is a calendar tool for keeping track of people (but could be adapted for any other object) on a daily basis. It is meant to replace that ubiquitous whiteboard in the office of the boss. You know the one, where someone has used a permanent magic marker to mark a matrix, and vacations/training/etc. are marked with non-permanent markers as blocks. absence is a CGI system, and has a resolution of one day. It is not intended to be used for keeping appointments or any other activity that requires a finer resolution. It generates an image for each month to be displayed using the GD library, and it can be configured to produce PNG or GIF (or even JPEG).
Connect Daily is a Web calendar and resource management application. Features include unlimited users, email reminders, public and private calendars, AJAX support, RSS, CSV import/export, and iCal support. Planner views and approvals prevent double-booking resources and make managing your facility a snap. A powerful security system provides flexible permission control. Authentication via LDAP or Active Directory is supported.