Web annotation tools are among the most important elements the 21st century digital kit educators need to have. These are free services that allow you to interact with web content by adding notes, commenting , highlighting, bookmarking and sharing. Below is a list I have compiled containing some of the best web annotation tools for teachers to use when navigating the net. Using these tools, teachers will be able to easily capture and draw on a webpage to point out specific elements to share with others. I have also recently published a list of 7 free bookmarking tools for educators that you can check out as well.