D3

Rationale

D3.js and Billboard.js are used to render pre-computed analytics in the platform dashboard.

The main reasons why we chose them over other alternatives are:

They are open source .
D3 is the de facto standard for data-driven documents and gives full control over rendering and DOM; generators use it for selection and layout (e.g., d3.select, d3.selectAll).
Billboard.js is built on D3 and provides ready-made chart types (line, bar, stacked bar, etc.) that match our needs and reduce custom code.
The stack fits our analytics pipeline: pre-computed data is stored, then served to the front end; no server-side chart rendering is required.
Charts run in the browser from static JSON produced by generators.

The following alternatives are being considered:

Chart.js is a popular, lightweight charting library.
The current stack (D3 and Billboard) better matched our need for DOM control in generator scripts and ready-made chart types.

Evidence.dev is an open-source BI framework (Markdown + SQL) and could leverage Snowflake, which we already use.
Using it would require a different architecture (report server, embedding).

Apache ECharts offers many chart types and is another option worth considering.
We stayed with D3 and Billboard for their smaller API surface and existing generator integration.

We use D3.js and Billboard.js to render analytics in the platform:

Pre-computed chart data is loaded from storage and sent to the client.
The front end loads D3 and Billboard and runs chart the generator logic for each visualization.
Generators consume the data and use D3 and Billboard to draw the chart on the page.