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

Lexomics – Divitext

divitext is a simple, online tool for dividing text documents into chunks.  

Rap Genius

Genius is the world’s biggest collection of annotated song lyrics.


Pliny is an online tool for note-taking and annotation.

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.