This "save for later" app allows you to file away useful articles, interesting videos and any other content that you want to hang on to for future use. When you find something you want to view later, simply put it in your Pocket, and you'll be able to access it from your phone, tablet or computer, even without Internet access.
Pearltrees is a web tool, iOS/Android app, and browser extension to categorize, curate and visualize bookmarks. The bookmarks turn up as thumbnails on a board. Teachers and students can move them around and name their boards of thumbnails.