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.

Edit Flow is a free, open source WordPress plugin designed for editorial collaboration. It includes a private discussion environment, metadata management and workflow tools.

FromThePage is a free software for manuscript transcription, allowing volunteers to transcribe document pages online. Transcriptions can then be marked up and annotated in a wiki-like enviroment, with the resultant text displayed on the public web. It includes a discussion environment, enabling collaboration on particularly difficult pages. FromThePage is currently in beta, permitting up to 100 pages per project, and is in the process of developing a paid version for larger projects requiring more server space, with price determined primarily by server and maintenance costs. Privacy features are also under development, and further features forthcoming based on feedback from users.

Yutzu is a collaborative tool for collecting and publishing multimedia content online, offered by the Cultureplex Lab at the University of Western Ontario. It is a web environment, designed to assist in the creative process, publication and visualization, and integrating a variety of multimedia tools. Yutzu has been used to showcase work, curate exhibitions and collections, and to facilitate teaching and learning.

Prism is a visualization tool that represents texts based on crowdsourced interpretations. Users are encouraged to highlight words in a text according to categories ("facets"). Users' individual interpretations contribute to a visualization combining the interpretations of all users of the text. As such, it reveals patterns in subjective readings of a text.

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.

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.

Community Contributed Collection (CoCoCo) is web software developed by the RunCoCo Project at the University of Oxford for collecting, cataloguing and managing web content such as text or uploaded files contributed by a community of users. It enables administrators to assess contributions for quality, approve project-appropriate contributions, and apply metadata where required. Once a contribution is approved, it is available for searching and browsing through the provided interface. CoCoCo utilizes Ruby on Rails, and is available under an Open Source version 3.0 license.

Digress.it was a free, open source WordPress plugin for annotating texts on the paragraph level, particularly of article to book-length documents. It permitted blog-like threaded discussions to occur in the margins of the text, and was aimed at facilitating scholarly, literary, political and other discussions. While the main website is no longer available, Digress.it is still available via the WordPress plugin directory.