GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Teachr - Agriya’s Udemy clone script, online teaching software helps you to start up your own online course learning platform and provide e-learning courses.
Oku - Track your book lists and get recs from your friends
Google Classroom - Learning management tool by Google
BookAuthority - BookAuthority collects the most recommended books on business, technology and science - as featured on CNN, Inc and Forbes
Skill Lake - Organize Learning | Content Track Progress | Grow Your People