Protovis
What is 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 visualization, Protovis defines marks through dynamic properties that encode data, allowing inheritance, scales and layouts to simplify construction.”
Protovis vs D3?
“Protovis is no longer under active development.
The final release of Protovis was v3.3.1 (4.7 MB) . The Protovis team is now developing a new visualization library, D3.js , with improved support for animation and interaction. D3 builds on many of the concepts in Protovis; for more details, please read the introduction and browse the examples .”