* [Heat.js 5.2.0](https://github.com/williamtroup/Heat.js) – Lightweight JavaScript library for generating customizable heat maps, charts, and statistics to visualize date-based activity and trends.

* [HeatMap v2.3.4](https://github.com/uiwjs/react-heat-map) – Lightweight calendar heatmap component built on SVG, customizable like GitHub's contribution graph.