FreeBu - Smart free/busy calendar sharing and meeting organizer.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
Koalendar - Free Online Appointment Scheduling Software
Fasterplan - Fasterplan is a collaborative tool that helps you and your friends/business partners to better...
Trafft - An online scheduling software that provide support to any business that relay on bookings.