Astro : Astro is an all-in-one web framework for building fast, content-focused websites.
Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
Morris.js : Morris.js is a lightweight library that uses jQuery and Raphaël to make drawing time-series graphs easy.
This is an open-source “spin-off” from the SIMILE project at MIT. Here we offer free, open-source web widgets, mostly for data visualizations. They are maintained and improved over time by a community of open-source developers.