DataWrangler is an interactive tool for data cleaning and transformation. Spend less time formatting and more time analyzing your data.
OpenRefine is a free, open source power tool for working with messy data and improving it.
Statistical analysis
The R Project for Statistical Computing. R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.
Visualization applications and services
Google Fusion Table is an experimental data visualization web application to gather, visualize, and share data tables.
Gephi is an interactive visualization and exploration platform for all kinds of networks and complex systems, dynamic and hierarchical graphs.
Vidi module serves as a guide to choose adequate visualizations from Timeline, Tagmap and GVS modules for specific data, and helps in process of preparing data and visualizations. It provides easy to use wizard for Timeline, Tagmap and GVS modules with visualizations preview.
Weave is a new web-based visualization platform designed to enable visualization of any available data by anyone for any purpose. Weave is an application development platform supporting multiple levels of users – novice to advanced – as well as the ability to integrate, analyze and visualize data at “nested” levels of geography, and to disseminate the results in a web page.