VObject is intended to be a full-featured Python package for parsing and generating vCard and vCalendar files. vCard 3.0 files are supported.
Simple command-line CalDav client, for adding and browsing calendar items, todo list items - tobixen/calendar-cli
The Debian project's canonical list of groupware available for Debian.
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The personal, minimalist, super-fast, database free, bookmarking service by the Shaarli community