Wordle is an online toy for generating word clouds using the text you provide.  Text can be submitted by providing an URL or by pasting raw text into an input.  The most frequent words from the text are then used as the source for the resulting visualization, where frequency is used to determine the size of each word.

You may customize the output by choosing from a variety of display options (layout, font, colours) or use the randomize feature to get a random visualization.  Additionally, there is built-in stop word support for many common languages, and the option to change the word case.

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.

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

MAXQDA is a commercial software package for facilitating qualitative and mixed methods research. It includes a graphical interface for organizing and categorizing data, and can import data in a wide variety of formats, including web formats, images, audio and video and spreadsheets. Data can be encoded in several ways, such as keywords, colours or symbols. It includes visualization and report generation.

Quadrigram is an environment for data gathering, query and visualization, based on a visual programming language and intended for users with no experience programming or creating visualizations. At present, it contains 50 different visualizers.

TimeRime is a free, web-based timeline application for creating, viewing and comparing interactive timelines. This application requires registration, and timelines created within the application are public.

Tableau Public is a free data visualization tool aimed at online publishers and academics. It can be used to create an interactive visualization, and also enables users to publish it to the web as an embed or share it via a link. Users must download the desktop interface, and all projects created through the system are saved remotely to the Tableau Public server rather than to the user's local machine. It is availabe for both Windows and OS X, and has a visual interface with a simple drag and drop process.

Coggle is a web-based tool for visualizing and applying non-linear structuring to information. Though Coggle has been used for mind mapping, it is primarily a method of documenting branching and non-linear information, and encompassing multiple perspectives. It utlizes a drag and drop interface for integrating images, permits multiple users to edit at the same time without causing data conflicts, and supports Markdown and LaTeX formatting. Coggle diagrams can be interlinked, branches of one diagram can be spawned off into its own diagram connected back to the original, and individual branches can be linked via hashtags. The tool includes an API that permits users to interface their diagrams with other programs and manupulate or examine them, and diagrams can also be exported in various formats such as plain-text outline, vector PDFs or images. Coggle is free except where users require more than 100 monthly active users or a closed source version.

ANTHROPAC, now in version 4.98, is a long-standing menu-driven DOS program developed for working with anthropological and other cultural data. It assists both the collection and analysis of datasets, and can accommodate both qualitiative and quantitative information. ANTHROPAC includes analytic tools such as consensus analysis, factor analysis, cluster analysis and correspondance analysis, in addition to data manipulation and transformation functions. It imports and exports data via ASCII formats, and includes an extensive reference manual, a user's guide and a methods guide tailored for cultural domain analysis.