vizzu-lib

Vizzu does something no other charting library does well. It's built around the idea that data stories are told through transitions, not static images.

You feed it a dataset and describe how you want it visualized. Change the description, and it animates the transition. The same data can flow from a grouped bar chart to a treemap to a bubble chart with physics-based animation. It's impressive to watch and makes presentations and dashboards feel alive.

Completely free under Apache 2.0. No paid tier, no premium chart types, no watermarks. For standard charting, Apache ECharts or Chart.js are the workhorses. For custom data art, D3 is still king. Vizzu fills the niche of animated data storytelling that nothing else does as cleanly.

The catch: this is a presentation and storytelling tool, not a drop-in replacement for Chart.js or D3. If you need standard dashboards with tooltips, drill-downs, and real-time updates, Vizzu isn't built for that. The API is also different from what you're used to. It's not "make me a bar chart," it's "here's data, here's how to arrange it." There's a learning curve. The community is small and documentation could be better.