BRAT

brat is a web-based tool for structured text annotation; that is, for adding notes to existing text documents. http://brat.nlplab.org/

Lexomics – Divitext

divitext is a simple, online tool for dividing text documents into chunks. http://cs.wheatoncollege.edu/divitext/  

Rap Genius

Genius is the world’s biggest collection of annotated song lyrics. https://genius.com/artists/Rap-genius

Pliny

Pliny is an online tool for note-taking and annotation. http://pliny.cch.kcl.ac.uk/index.html

Hyperstudio – Annotation Studio

Annotation Studio is an open source web application that engages students in close reading and textual interpretation. It integrates a powerful set of tools with an interface that makes using those tools intuitive for undergraduates. http://hyperstudio.mit.edu/projects/annotation-studio/