MemberVault - MemberVault is a flexible platform that helps you to create, deliver, and sell your services, courses, memberships, subscriptions, etc.
Question2Answer - A Q&A site helps an online community to share knowledge.
Ruzuku - Ridiculously easy online courses
Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
Opentute - Opentute helps businesses to effortlessly launch a private eLearning and communication platform to engage teams and clients.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.