ics
iCal (ics) file generator
rrule
JavaScript library for working with recurrence rules for calendar dates.
ical-generator
ical-generator is a small piece of code which generates ical calendar files
timezones-ical-library
Easy direct access to the most recent official timezone information for iCalendar files via JavaScript
datebook
Generates URLs and ICS file content for adding events to popular calendar apps.