Highcharts

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 310px; height: 400px; max-width: 600px; margin: 0 auto"></div>

JavaScript

$(function () {

    $(document).ready(function () {

        $('#container').highcharts({
            chart: {
                plotBackgroundColor: null,
                plotBorderWidth: null,
                plotShadow: false,
                marginBottom: 80
            },
            title: {
                text: 'Porcentagem de acesso ao site'
            },
            plotOptions: {
                pie: {
                    allowPointSelect: true,
                    cursor: 'pointer',
                    dataLabels: {
                        enabled: true,
                        format: '<b>{point.name}</b>: {point.percentage:.1f}%'
                    },
                    showInLegend: true
                }
            },
            legend: {
                enabled: true,
                floating: true,
                useHTML: true,
                labelFormatter: function() {
                    return '<div style="text-align: left; float:left;">' + this.name + ': ' + this.y + '</div>';
                },
                align: 'center',
                borderWidth: 1
            },
            series: [{
                type: 'pie',
                name: 'Total',
                data: [
                    ['Segunda',  68],
                    ['Terça',    10],
                    ['Sábado',   46],
                    ['Domingo',  100],
                ]
            }]
        });
    });

});