MemberVault - MemberVault is a flexible platform that helps you to create, deliver, and sell your services, courses, memberships, subscriptions, etc.
Time Slot Booking Calendar PHP - Time Slots Booking Calendar PHP for online appointment booking and class scheduling.
Ruzuku - Ridiculously easy online courses
Pulse 24/7 - Booking & scheduling mobile app for service providers
Opentute - Opentute helps businesses to effortlessly launch a private eLearning and communication platform to engage teams and clients.
Dudle - Dudle is an online scheduling application, which is free and open source.