Dudle - Dudle is an online scheduling application, which is free and open source.
Slack - A messaging app for teams who see through the Earth!
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Quip - Quip is the modern productivity suite that simplifies your life and helps your team get work done faster.
Framadate - Make your polls
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.