GLeave, short for Graham's Leave, is an evolving Perl clone of the Berkeley leave program that was written in C. gleave reminds you when you have to leave. gleave waits until the specified time, then reminds you that you have to leave. You are reminded 5 minutes and 1 minute before the actual time, at the time, and every minute thereafter for 10 minutes.
NullLogic Groupware is a modular Web-based groupware and email system designed for contact management and event scheduling. Additional features include private messaging, public discussion forums, webmail, shared bookmarks, file sharing, call tracking, order processing, an XML-RPC API, and integrated POP3 and SMTP servers.
VCalSax is a simple Python module for managing scheduler data in XML. It enables loading data from VCalendar files into DOM trees, and to rewrite such trees as VCalendar files. To make such conversions, VCalSax defines a Sax parser which changes the VCalendar format to a specific XML format, and a XSL Transform to build VCalendar files. VCalendar is a standard format for scheduler data used in many calendar software (KOrganizer, Evolution, etc.).