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.
CalCore is an advanced, flexible calendaring component for Python. It allows the Python developer to write advanced calendaring applications either using their own event storage or integrating with external calendar servers. It features support for private calendars, shared calendars, resource booking, integration with iCalendar clients (Apple iCal, Mozilla Sunbird, KOrganizer) using the iCalendar protocol, invitation workflow, meeting support, including helper functions to look for free time, and recurring event support. It is being used as the core of Nuxeo's CalZope and CPSSharedCalendar products.
smupcheck, which stands for Smart Update Checker, checks Web sites for updates automatically, even if they don't offer an RSS feed. It is a very basic tool, and does not offer advanced features such as checking password-protected Web sites, highlighting changes, or filtering results.