LowCal is a lightweight Web-based calendar of events. It is designed to allow you to announce events that have already been planned (it's not "groupware" and doesn't do "calendaring") without requiring the installation of PHP or a database backend. Events can be categorized and users can choose to display one, multiple, or all categories. Viewing modes include tabular monthly calendars and plain event lists, with or without details. Recurring events are well-supported using a cron-like syntax. All display is template-based, allowing complete configurability.
Mioga is a groupware application suitable for intranet use. All the functionality of Mioga can be reached through any HTML browser. The interface is designed with XML/XSL technology which allow the look and feel and the ergonomics of Mioga to be fully and easily customizable. It is written in Perl and uses a PostgreSQL database. It uses DAV for file management, providing you with a complete DAV workspace with Mioga user access controls (ACLs). Mioga includes the followig applications: file manager, organizer, todo tasks, shared folders (with version control), forms, intranet search, and administration tool.