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Lemmings - Lemmings is a Side-Scrolling, Puzzle-Platform, Single and Multiplayer video game developed by DMA Design and published by Psygnosis.
Courseroot - Biggest online course database on the web
Learn Forward - An open source tool for context-aware digital textbooks
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
Quesba - Search millions of textbook solutions
Podia - Podia is your all-in-one digital storefront. The easiest way to sell online courses, memberships and downloads, no technical skills required. Try it free!