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.

Welkin is a free tool for visualizing complex RDF models offered for download by the SIMILE Project. Rather than permitting users to focus on specific nodes, it provides analytical views such as an overview of a dataset's connectivity or potential mappings between resources and ontologies. It runs best through Java WebStart and is compatible with Windows, OS X and Linux.

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.

IsaViz is a visual authoring and data browsing tool for RDF models represented as graphs, developed by the W3C. permits uses to both create and edit graphs, and can render graphs from GSS stylesheets as a node-link diagram. It is freely available for download. This tool is no longer in active development.

Paper Machines is a topic modelling and visualization tool available as a plugin for Zotero. It analyzes Zotero bibliographic collections based on a selection of text mining processes, and enables users to export a variety of visualizations, such as word clouds, phrase nets or heat maps, from the results.

jsLDA is a free, open source tool for corpus-based in browser topic modelling. Users can test the tool via the provided demo, or download the source code to run on their own system. Users can load any corpus accessible from a URL, and can train the tool on the topics within the corpus via the iteration function. Once jsLDA has been trained to the user's satisfaction, documents can be sorted according to topic and explored based on topic correlations.

Topic Modelling Tool is a free, open source tool for Latent Dirichlet Allocation topic modelling with a graphical user interface. The tool learns topics in a user-supplied corpus of plain text files, and outputs results as a CSV file for further analysis.

Library Lookup is a bookmarklet that can look up whether a book is available in the user's local library, based on information about that book on a separate website (e.g. Amazon). Supported library systems are listed here.