FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Croodle - Croodle is a web application to schedule a date or to do a poll on a general topics.
FreeBu - Smart free/busy calendar sharing and meeting organizer.
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.