Procyon is a declarative statistical visuzualization library for Rust. This description is directly taken from the very good Altair project.
This crate build upon Vega-Lite specification and support the version 3 and version 4 of its sepcification. Vega-Lite is a high-level grammar of interactive graphics. It provides a concise JSON syntax for rapidly generating visualizations. Vega-Lite specifications can be compiled to Vega specifications. Those specifications are then parsed by Vega’s JavaScript runtime to generate both static images or interactive web-based views.