There are two categories of Multidimensional Visualizations. The first looks at category proportions; or category counts. The second examines the relationships between the variables.
Examples of visualizations that show category proportions or counts: pie chart, Wordles, bar chart, histogram, rank plot, tree map
Examples of visualizations that show relationships between variables: scatter plot, line chart, step chart, area chart, heat map, matrices, parallel coordinates/sets, radar/spider chart, box and whisper plots, mosaic display, waterfall chart, pixel bar chart, tabular comparison of charts
Display live data on your website. Includes Introduction, Quick Start, and Chart Gallery for ideas.
An experiment by IBM Research and the IBM Cognos software group. View others' visualizations, upload your own data and create your own visualizations.
Tableau Public is a free tool that "brings data to life" (according to their website). View others' visualizations or create your own. Tutorial included.
Web-based Analysis and Visualization Environment is designed to enable visualization of any available data. WEAVE has a wide array of options for working with different data types.
Generates “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes.