Pima Community College holds a college-wide license for this tool which enables students and faculty to: 1) annotate PDFs with highlights or drawing markups, 2) utilize text-to-voice tools within a pdf; and 3) support comment text and audio streams. To learn more about OrbitNote's See their intro video embedded below:
How Do I Access Orbitnote (as a student or teacher)
Other Technologies for Supporting Digital Annotation?
While this tool supports highly accessible, student-created or faculty-created annotation of PDFs, there are other tools you may want to consider for other collaborative annotation processes. These include Perusall (for faculty-created collaborative annotations of PDFs or textbooks) as well as most Google Tools which are especially helpful for texts co-constructed by students (e.g. Docs, Slides, Drawings, Sheets).