* [Keeper v2.7.0](https://github.com/ridafkih/keeper.sh) – Calendar syncing tool that aggregates remote iCal/ICS events and pushes timeslot-based events to destination calendars.

* [postgres-rrule v2.2.0](https://github.com/volkanunsal/postgres-rrule) – PostgreSQL extension parsing iCalendar RRULEs to generate and query recurring event occurrences, with EXDATE/RDATE support.

* [node-ical 0.25.6](https://github.com/jens-maus/node-ical) – Feature-rich iCalendar/ICS (RFC 5545) parser for Node.js.

* [golang-ical v0.3.4](https://github.com/arran4/golang-ical) – ICS/ICal parser and serializer for Go.