Wiechel projection, D3.js v4 by wboykinm

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.graticule {
  fill: none;
  stroke: #777;
  stroke-width: 0.5px;
  stroke-opacity: 0.5;
}

.land {
  fill: #BCA093;
  stroke: #777;
  stroke-width: 0.5px;
  stroke-opacity: 0.5;
}

.landShadow {
  fill: #B6C8E1;
}

.boundary {
  fill: none;
  stroke: #FDFDFD;
  stroke-width: 0.5px;
}

</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="//d3js.org/d3-geo-projection.v1.min.js"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    g = svg.append("g").attr("transform", "rotate(90 480,480)");
    
var filter = svg.append("defs")
    .append("filter")
    .attr("id", "drop-shadow")
    .attr("height", "130%");
  filter.append("feGaussianBlur")
    .attr("in", "SourceAlpha")
    .attr("stdDeviation", "4")
    .attr("result", "blur");
    
var projection = d3.geoWiechel()
    .scale(214)
    .translate([width / 2, height / 2])
    .precision(0.1)

var path = d3.geoPath()
    .projection(projection);

var graticule = d3.geoGraticule();

g.append("path")
    .datum({type: "Sphere"})
    .attr("class", "sphere")
    .attr("d", path)
    .attr("fill", "#1E2C4F")
    .attr("stroke", "black");
    
g.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);

d3.json("world-50m.json", function(error, world) {
  if (error) throw error;

  g.insert("path", ".landShadow")
    .datum(topojson.feature(world, world.objects.land))
    .attr("class", "landShadow")
    .attr("d", path)
    .style("fill", "#1E2C4F")
    .style("filter", "url(#drop-shadow)");

  g.insert("path", ".land")
    .datum(topojson.feature(world, world.objects.land))
    .attr("class", "land")
    .attr("d", path);

  g.insert("path", ".boundaries")
    .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
    .attr("class", "boundary")
    .attr("d", path);
});

</script>