At present, coulnd't find anything really close. Most of the calendar and scheduling software around differ in significant ways. If you are aware of any relevant related project, please contact author (see Home page).
The following might be related, but output uses a specific graphical user interface, making it uneasy to share information.
If you need a true web app, check out
phpicalendar (https://sourceforge.net/projects/phpicalendar/) But this seems to be only a rendering engine, the input data being a set of ical files.