FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Hive - Seamless project management and collaboration for your team.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Sup! Standup Bot - The complete stand-up and follow-up bot
Dudle - Dudle is an online scheduling application, which is free and open source.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.