FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Loomio - Loomio helps groups of people make decisions together, online.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Framadate - Make your polls
FreeBu - Smart free/busy calendar sharing and meeting organizer.
tricider - Easy decision making. Creative and collaborative.