Collectably is a content curation web app which allows you to bookmark any web site and to organize it into visual collections. A unique Chrome extension makes Collectably particularly useful as it pioneers the ability to save all of your open tabs into a visual collection that you can immediately prune, organize visually and sub-divide into specific groups.
This feature by itself is worth gold for any serious researcher or content curator as it allows to easily move from seeing just trees into seeing the whole forest and into organizing into logical groups for further work. Priceless.
If you frequently search and explore new information and tools online, I highly recommend it. It's that good.
Free to use.
Try it out now: http://collectably.com/
Chrome extension and Bookmarklet: http://collectably.com/#/tools
N.B.: You have by default a similar functionality available inside Firefox. It is called Group Tabs and you can activate it by goign to the View menu -> Toolbars -> Customize and by dragging the mosaic looking Tab Group icon into your browser top bar.
Try it. It's excellent. The only difference with Collectably is that Group Tabs are private to you and not shareable on the web.