Its an ANSI C library that does allow communication with google calendar and contacts, useful if you need to support this in a C or C++ application. Currently, libgcal implements: - authentication - get all events/contacts - atom stream parsing - access to individual events/contacts - add/delete/edit using gcal objects - add/delete/edit using raw XML - query for updated events/contacts - use of http proxy - timezone - contact photo download/upload - google data protocol GCalendar 2.0 and Contacts 3.0 - can be used with a C++ application - google hosted accounts (i.e. joe@foobar.com)