Nice brainstorming/concept mapping tool with lots of features, even in free version. Includes several templates, ability to include images, stamps, links, maps, more.
Useful tool lets you upload PowerPoint or Keynote presentations and then share as a link. You can then insert polls or questions and get real-time feedback from students/viewers.
Free learning management system with good collection of resources, including discussion threads, assignment sharing/grading, messaging tools, flashcards, color-coded subjects/classes, more.
Truly cool tool from Google inspires learners' questions and projects. Input what you are good at, what subject you enjoy, and what you want to do, and Google provides a tapestry (Yes, I just used the word "tapestry.") of links, videos, books, and other resources to get the creative juices flowing.