vCita - Online client engagement solution, convert website visitors to clients, free customizable contact form, free online appointment scheduler.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
CozyCal - Online appointment scheduling
Depot - Ingeniously simple business management
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.