D3.js is a free, open source JavaScript library for manipulating documents with data utilizing HTML5, SVG and CSS3. It is designed to create visualizations that work with current web standards to make the best possible use of the most recent browsers without requiring a proprietary framework. This tool allows users to bind data to an Document Object Model (DOM) and apply data-driven transformations to the document.

Data Wrangler is free web-based tool for interactive data cleaning and transformation. It takes raw data and transforms it into data tables for further analysis and cleaning. The results can be exported in a variety of data table formats, including Excel, R, Tableau and Protovis.