Examples of Leaflet, D3.js, and Chart.js
Figure 1 (top left): Historical correspondence map made with Leaflet. Read tutorial on Programming Historian.
Figure 2 (top right): Global heat map comparing Library of Congress holdings by country made with D3.js. Read global heat map tutorial from University of Michigan.
Figure 3 (bottom left): Network visualization of beer history made with D3.js. Read network visualization tutorial from University of Michigan.
Figure 4 (bottom right): Combined bar and line chart made with Chart.js. View Chart.js site including tutorials.