MentorMob: Educators and students can become their own curators using this resource to create their own learning playlists from sources all over the web, in addition to browsing the playlists of others.
Gooru: Just launched in beta, Gooru Learning is a "search engine for learning" that harnesses the power of the web by organizing free, online education resources into searchable collections, accessible from any web or mobile platform. Using machine learning and human judgment, Gooru curates, auto-tags and contextualizes collections of web resources to accommodate personalized learning pathways. Gooru collections are aligned to US Common Core Standards for Math and to California Science Curriculum Standards.
Backpack TV: Backpack.tv pulls from various sources to create a highly curated library of education videos organized by academic subject and detailed topic. Many of the videos are linked to topics from popular textbooks, a real bonus for finding just the right video. Videos can be user-rated.