Dovetail - Mobile Cloud-Based Dental Software
Dudle - Dudle is an online scheduling application, which is free and open source.
Loomio - Loomio helps groups of people make decisions together, online.
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
DemocracyOS - DemocracyOS is an open source application for online decision making.
Framadate - Make your polls