Kajabi - Kajabi is the only Knowledge Commerce platform today with everything you need to market, sell, and deliver your knowledge online.
Appointment Booking Calendar - With the Appointment Booking Calendar you can accept online bookings from a set of available time-slots in the calendar.
Opentute - Opentute helps businesses to effortlessly launch a private eLearning and communication platform to engage teams and clients.
MakePlans - Online appointment booking - MakePlans
MemberVault - MemberVault is a flexible platform that helps you to create, deliver, and sell your services, courses, memberships, subscriptions, etc.
Dudle - Dudle is an online scheduling application, which is free and open source.