An older alternative that does not rely on MathJax (produces png images) is QuickLatex: http://www.quicklatex.com/ http://www.quicklatex.com/ It even supports

An older alternative that does not rely on MathJax (produces png images) is QuickLatex: http://www.quicklatex.com/ http://www.quicklatex.com/ It even supports latex packages (e.g. tikz).