Gephi is a tool for people that have to explore and understand graphs. Like Photoshop but for data, the user interacts with the representation, manipulate the structures, shapes and colors to reveal hidden properties. The goal is to help data analysts to make hypothesis, intuitively discover patterns, isolate structure singularities or faults during data sourcing. It is a complementary tool to traditional statistics, as visual thinking with interactive interfaces is now recognized to facilitate reasoning. This is a software for Exploratory Data Analysis, a paradigm appeared in the Visual Analytics field of research.
PSPP is a program for statistical analysis of sampled data. It is a Free replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions.
PSPP can perform descriptive statistics, T-tests, linear regression and non-parametric tests. Its backend is designed to perform its analyses as fast as possible, regardless of the size of the input data. You can use PSPP with its graphical interface or the more traditional syntax commands.
Google Chart Tools provide a perfect way to visualize data on your website. From simple line charts to complex hierarchical tree maps, the chart galley provides a large number of well-designed chart types. Populating your data is easy using the provided client- and server-side tools.
Google Fusion Tables lets you store, share, query, and visualize data tables. It offers a REST API to manage tables, info window templates, and styles. The query endpoint offers allows you to manage data rows (insert/update/delete), and query the table for all rows that match spatial or data conditions. The results of queries can be CSV or JSON, or used in the Google Maps API or Google Chart Tools.
Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for visualization, Protovis defines marks through dynamic properties that encode data, allowing inheritance, scales and layouts to simplify construction. Supported chart types are area, bar, column, scatter, pie, donut, line, stacked, grouped, force-directed, streamgraphs and parallel coordinates charts.
The XMLMate Plug-In adds an XML parsing palette to the popular TextMate text editor for Mac OS X. While editing an XML (or XHTML) document in TextMate, you can open the XMLMate palette to conveniently check your document for well-formedness or validity against a DTD, W3C XML Schema, RELAX NG schema, or Schematron schema.