Here is a set of the main features that Learnist offers to its users :
It is free Itis easy to use It has a user friendly interface It lets users create pinboards around a certain topic Users can create different boards and invite others to collaborate on them It lets you pin images,videos, and text to your boards with a single click from Learnist bookmarklet Users can also upload resources to their boards using URLs
Free to use.
Try it out: http://learni.st
Via Robin Good, Gust MEES, Andreas Wåhlström