NLTK 2.0 (Natural Language Tooklt) is a free, open source collection of Python modules, linguistic data and documentation for research and development in natural language processing and text analytics, with distributions for Windows, Mac OS X and Linux. It offers a platform for building Python programs to work with human language data, and integrates a guide to programming fundamentals.

Exhibit 3.0, a part of the SIMILE Widgets family of tools, is an open source software tool for web-based data publishing. This JavaScript-based browser widget facilitates searching, browsing, navigating and visualization data, and enables users to publish their data collections as websites without requiring programming, a database or access to a server.

TagCrowd is a tool for generating a frequency-based word cloud from a source text, with a free browser version available through the TagCrowd website. A commercial version may also be purchased, subject to a creative commons license.

Juxta is a free, open source tool for comparing and collating texts, originally intended for comparing multiple versions of the same text. It offers several views and visualization options, including histograms and side by side comparison. Juxta is available as both a desktop application and as a web service that can be integrated into the user's own website.

Sophie is a free, creative commons authoring tool from the Institute for the Future of the Book and the University of Southern California's School of Cinematic Arts that enables collaboration, reading and publication. Its highlights include an authoring environment that allows users to create complex networked multimedia documents, a reader than opens books in a browser without downloading additional software, comment frames for adding discussions within books, digital libraries compatible with the Sophe iPad app, timeline creation and collaborative book creation. As of version 2.1, Sophie includes HTML5 export for data integrating multimedia content and for use on a wide variety of devices.

VARD 2 is a free, creative commons tool for preprocessing historical corpora. Built in Java, it enables researchers to easily match up historic variant spellings with modern conventions. Though optimized for Early Modern English, other languages can be accomodated with user-supplied variant word lists.

GATE (General Architecture for Text Engineering) is free, open source software offered by the University of Sheffield since 1995. It provides a framework for users to gather a corpus, apply an ontology to it, develop markup, automate the application of the markup to the corpus and add tools such as knowledge facet search, ontology browsing or graphing.

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.

LodLive is a web-based tool developed to demonstrate Linked Data standards applied to browsing RDF resources with a simple interface. Users can search preset datasets, including DBpedia and Freebase, or search a resource available at a web address of the user's choice. LodLive is also available for download.

Annotation Studio is an open source, web-based annotation application that integrates a powerful set of textual interpretation tools behind an intuitive and easy-to-use interface. Users can upload their own texts, and annotate with styled text, video, images, and weblinks. To date, the project has been used with great success in disciplines such as Writing, Literature, Foreign Languages, Anthropology, Film and Media Studies, and others at institutions including Harvard, Yale, Stanford, MIT, Barnard College, and Washington University.