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.
Dudle - Dudle is an online scheduling application, which is free and open source.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Basecamp - A simple and elegant project management system.
Framadate - Make your polls