Loose group management tool with calendar, wiki and newsletter application. This application was originally written for the art space Subterrarium.
Its main purpose, the calendar, is to organise chores between staff on a voluntary basis. This is implemented by defining types of events with certain tasks. Each event in the calendar is of one type and has thus a pre-defined list of tasks. Members can sign upfor this tasks. If an event has open tasks the application will send out e-mails.
The wiki is a very basic affair, no revisions, etc.
The newsletter application allows to have muliple lists. Subscribers can be added manually by administrators or via public formular by anyone (requiring e-mail confirmation). Newsletters can contain links for unsubscribing. There's basic support for handling bounces.