To know what it is, click here.
To download the software, click *URL edited out by request. Illegal version btw*
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How to use it ¿?
Once installed the software, go to Preferences $\displaystyle \implies$ Translators. Now go to Translation to other language (text) and select the following translator: TeX -- AMS-LaTeX.
Deactivate the option Include MathType data in translation.
And ready to go! All you need to do is write something and paste it into the forum. For example, it'll appear something like
\[
\int_b^a {x\,dx}
\]
Remove the \[ and \], put [tex][/tex], you'll get:
[tex]\int_b^a {x\,dx}[/tex] which generates $\displaystyle \int_b^a {x\,dx}.$
And we're done
Hope it helps.