The Versioning Machine, now in version 4.0, is a framework and an interface for displaying multiple versions of text, and encodes the text according to TEI guidelines. It incorporates features found in both critical editions and electronic publication, in addition to providing an environment for textual editors to comparatively view the results of their edits. This tool may be downloaded for use on a local machine, or hosted on one's server for web usage.

Bookworm is a free tool from the Harvard Cultural Observatory designed to generate data from searches on the Open Library and Internet Archives' collections of public domain books. It allows users to search keywords, including in multiple languages simultaneously, and narrow terms by country, gender, subject and header. At present, Bookworm is restricted to searching books published between 1820 and 1920 due to availabliity. The tool produces a graph showing instances of each keyword over time, enabling easy comparison of results.

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.

DiscoverText is a cloud-based textual analytics tool available for purchase. It is designed to collect data from sources such as social media, blogs and a variety of document formats, and generate tag clouds and reports from the resulting corpus.

Concordance is a commerical text analysis and concordance tool originally developed for the Humanities (formerly available via the University of Dundee School of Humanities). It offers features for text analysis, word lists, indexes, full concordances, word frequencies and more. A free trial version is available.

Meld is a free, open source tool for comparing files, directories and version-controlled projects developed in Python by Kai Willadsen. It features two- and three-way comparison of files and directories, supports numerous version control systems, and is particularly useful for reviewing changes to code. This tool can be downloaded or run without an install via the command line by copying the source code directly from the repository.

Tesserae is a web-based interface for exploring intertextual parallels. At this stage of the project, it only permits comparison of texts from three curated corpuses, representing selections from canonical Latin, Greek and English literature.

LATtice is a free visualization tool for exploring and comparing texts across corpora. It also has features for 'drilling down' to determine what rhetorical categories make texts similar or different, and shows multiple visualizations in the same view. Documentation is available with download, and LATtice is available in Windows, OS X and Linux versions.

HyperPo is an important legacy tool, developed as the first web-based text analysis tool aimed at humanities scholars available from 1996 through 2006. Users could input a web address, upload a file or directly enter text for analysis. HyperPo's interface was available in both English and French. Though no longer available for use, a capture of HyperPo can be viewed through the Internet Archive's Wayback Machine.

Textable is a an add-on tool developed for the Orange data mining and visualization package. Its functions include the ability to build data tables from textual data, to import data from other sources, and to build concordances and collocations. It also enables users to segment and annotate text, systematically recode data, determine subsets, and compute frequency and complexity measures.