Pearltrees is a great, free site that lets you organize web content in a visual pattern. There is a Chrome browser extension that makes it easy to add sites to your tree. Trees can be shared and even worked on collaboratively.
What is nice about this vs. other bookmarking tools is that you can organize your sites visually and connected by related topics or ideas.
There are no limits to how many trees you can create, and you can either use the extension or just add in links manually.
This is a great tool for educators to use to organize web resources for themselves, their classes and students, or for colleagues. It is also great for students to use for organizing for themselves, or for a class project.
Here is an example Pearltree on Educator Resources:
