Hypothes.is is a great FREE tool for online annotation. The link above provides instructions for setting it up, learning activity ideas, and resources for teachers and students. This post on the TPS Western Region blog utilizes Robert Frost's The Gift Outright to build historical context.
Example Online Analysis Activity:
After students have downloaded the free web extension for their browser, direct them to School Begins on loc.gov.
Students can utilize the Primary Source Analysis Tool to email their Observations, Reflections, and Questions to the teacher.
Provide them with prompting questions and model annotation before they begin. For example:
It doesn't really matter where students highlight and annotate the text, especially if they are replying to question prompts.