Highcharts
Commercial JavaScript charting library. Torstein Hønsi (Norway), 2009. Free for personal/non-commercial use, paid for business. Standard in enterprise dashboards.
SVG-based, mobile-friendly, accessibility support. The family: Highcharts (charts), Highstock (financial), Highmaps (geographical), Gantt. Competitors: Chart.js (free, canvas), ApexCharts (free, modern), Recharts (React-only), AG Charts (same company as AG Grid). D3 is lower-level. Plotly is another commercial rival. Less buzz today because free alternatives are taking market share, but Highcharts has 20+ years of reliability + support.