Going the other way, if you want to enter the LaTeX variant called MathJax locally (PC and Mac), which is used on math.stackexchange.com (among other other places), try <a href="http://www.inkcode.net/qute" rel="nofollow">http://www.inkcode.net/qute</a>. I find this very handy for short to moderate length math.<p>In my weirdness, I like to use qute in split-screen mode, and work out the math as I enter it, never writing anything down. I then make corrections, modify things, move lines around, all in qute. I have developed some techniques for having correct MathJax syntax at almost all times, which I find necessary since qute does not show the result of an incorrect expression.<p>I find qute very useful for formatting math. Since it is all offline, no connection is needed. After the formatting is correct, I can then push it to the clipboard and paste it into whatever I want (usually math.stackexchange.com).<p>I recommend qute highly. Again, it is for Windows and Mac OS, not Linux (unfortunately).