Not quite two years ago, I published a paper with Martin Wattenberg titled “Stacked Graphs — Aesthetics and Geometry” in which we discussed the problems surrounding the use of stacked graphs, and presented a new stacked graph layout technique we called Streamgraphs.

Not sure if this is stupid or awesome

A free, GPL, non-interactive software package for producing plots, charts, and graphics from data.

A Java-based toolkit for building interactive information visualization applications.

Several of you have asked us about the graphing and visualization package we use to generate graphs at Swivel. Here's a bit of history about how we chose our graphing package.