Commentpress is an open source theme and plugin for Wordpress 3.3.1 or later designed to enable readers to contribute comments to each paragraph of a text and display those comments in the margins. Commentpress turns a text into a conversation, whether a blog or a fixed document such as an essay, book or article. It may also be used to add a gloss or annotations to a document. This tool is also available for BuddyPress and BP Group Blog.

MorphAdorner, now in version 2.0, is a Java command-line program for the adornment of words in a text. At present, available adornments include standard spellings, parts of speech and lemmata, in addition to tokenization, the recognition of sentence boundaries and extracting names and places. Version 2.0 features a separate MorphAdorner Server, an improved integration with MONK's Abbot and improved processing of the Early English Books Online (EEBO), Eighteenth Century Collections Online (ECCO) and Evans Early American Imprint Collection corpori.

WordHoard is a tool for the study of large texts or transcribed speech. It annotates or tags texts by applying morphological, lexical, prosodic, and narratological criteria. Users may apply WordHoard to their own texts, or to the corpora included with the tool. At present, that corpora includes the entire canon of Early Greek epic (original and in translation), Chaucer, Shakespeare and Spencer.

The brat rapid annotation tool is an online environment for collaborative structured annotation of texts. It can be run in a browser (optimized for Chrome and Safari) or downloaded for local installation. It can be used for a variety of annotation tasks, from identitifying natural language entities to chunking to adding metadata.

ATLAS.ti is a tool for systematic qualitative data analysis released under a for-pay license. It offers multi-window frames, overviews generated through interactive network views utilizing visual interconnections, and cloud views and reports. A free demo version is also availalble, and does not include a time limit. This tool was first developed in 1989 and has been in continous development since. The web edition has been available since 2002.

NVivo is a commercial software package for creating workspaces and corpuses. Its features include importing YouTube videos and comments, social media posts and discussions, web page and PDF capture, multiple language support and support for a wide variety of data formats such as spreadsheets, images, database tables and so on. Users can query their data in a variety of ways, annotate, cross-link and visualize connections, ideas and findings with charts, maps and models

The DM is an environment for studying and annotating images and texts. It enables users to link together images, texts, or fragments of images or texts, such as a textual annotation of an image or text. It is aimed at scholars of English and French literature, art history, and musicology, and to work with digitized Old English, Latin and Old French manuscripts, medieval maps and scrolls.

The Domeo Annotation Toolkit was an extensible web application for creating and sharing ontology-based stand-off annotations on HTML or XML documents. Users could add annotations manually, or via the tool's full or partial automation options. It also included functions for controlling access authorization and control for both personal and community annotations.

Digitate is a free, open source application for making notes and annotations directly on an image of a cultural artifact such as a manuscript or a painting. Images can also be grouped into projects, saved for later or exported. This application is only available for the iPad.

WordFreak is a free, open-source tool for linguistic annotation. It is designed to support both human and automated annotation of linguistic data, and learns human corrections of automatically annotated data.