D3.js (D3 for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. Developed by Mike Bostock
License: Open Source
CanvasJS Charts is ideal for users seeking ease of use and quick integration with straightforward licensing, making it suitable for standard charting needs. In contrast, D3.js offers unparalleled customization and flexibility for complex data visualizations, although it comes with a steeper learning curve and requires more coding expertise.