Vega and Vega-Lite are visualization tools implementing a grammar of graphics, similar to ggplot2.

[3] Vega is used in the back end of several data visualization systems, for example Voyager.

[4][5] Chart specifications are written in JSON and rendered in a browser or exported to either vector or bitmap images.

Bindings for Vega-Lite have been written in several programming languages, such as the Python package Altair,[6] to make it easier to use.

The grammars and associated tools are open source projects led by the University of Washington Interactive Data Lab and released under a BSD-3 license.