Recogito is an online platform for collaborative document annotation. Users can upload texts, images or tabular data into the platform and collaboratively annotate and interpret those documents. Annotations can consist of comments and tags or identify specific people, places, or events.
AntConc is a free desktop corpus search and concordancing program available for Windows, Mac, and Linux with powerful functions for analyzing corpora, including concordancing, collocation search, and n-grams lists.
Voyant (Tools) is an online text comparison, analysis, and reading environment. Voyant offers a wide variety of tools (28 at the moment) for analyzing and visualizing text corpora. Corpus texts can be uploaded to Voyant or pulled from the web.