The [] site is an annotated and categorized catalog of good visualization tools.

> This site features a curated selection of data visualization tools meant to bridge the gap between programmers/statisticians and the general public by only highlighting free/freemium, responsive and relatively simple-to-learn technologies for displaying both basic and complex, multivariate datasets.

via [FlowingData]

[]: "a curated guide to the best tools, resources and technologies for data visualization"
[FlowingData]: "Catalog of visualization tools"