Any content type with a "start-date" or "datetime" field can be exported in iCal (.ics) format.
url is of the form [URL_SERVEUR]/_plugins/calendar/[LANG]/export-event.ics?contentId=[ID_CONTENT]
Integration example: adding a link to rendered content
<a class="link export" href="{$site-uri-prefix}/_plugins/calendar/{@language}/export-event.ics?contentId={@id}">Exporter au format iCal</a>
<a class="link export" href="{$site-uri-prefix}/_plugins/calendar/{@language}/export-event.ics?contentId={@id}">Exporter au format iCal</a>
<a class="link export" href="{$site-uri-prefix}/_plugins/calendar/{@language}/export-event.ics?contentId={@id}">Exporter au format iCal</a>