MySwat GPA Scraper - Login to mySwarthmore, then: Student Main Menu -> Student Records -> Grades at a Glance and then run this in the console. I'm going to make it a bookmarklet later.

gpaScraper.js

var gradeEquiv = {
	'A+': 4,
	'A' : 4,
	'A-': 3.67,
	'B+': 3.33,
	'B' : 3,
	'B-': 2.67,
	'C+': 2.33,
	'C' : 2,
	'C-': 1.67,
	'D+': 1.33,
	'D' : 1,
	'D-': 0.33,
	'E' : 0
};

function zip(arrays) {
    return arrays[0].map(function(_,i){
        return arrays.map(function(array){return array[i]})
    });
}

function getTableColumnValues(col){
    var columnValues=[];
    $('table[id=R378781212054339999]').each(function() {
        $('tr>td:nth-child('+col+')',$(this)).each(function() {
          columnValues.push($(this).text());
        });
    });
    return columnValues;
}

function calculateGPA(info, gradeEquiv){
	var c = 0.0;
	var p = 0.0; 
	for (var i = 0; i < info.length; i++) {
		credit = parseFloat(info[i][0]);
		grade  = info[i][1];
		if (grade !=  'CR' && isNaN(grade) && credit > 0) {
			p += gradeEquiv[grade] * credit;
			c += credit 
		}
	}
	return Math.round(p / c * 100) / 100;
}

var credits = getTableColumnValues(3);
var grades  = getTableColumnValues(4);
var zipped = zip([credits, grades]);
var GPA = calculateGPA(zipped, gradeEquiv);	

alert("Your GPA is a " + GPA + "/4 after " + credits.reduce(function(a, b) {
  return parseFloat(a) + parseFloat(b);
}) + " credits!")