R

1. xtable{xtable}

   • Good for converting table to LaTeX code.

2. latex{Hmisc}

   • Convert R objects (not just tables) to LaTeX code.

Excel

MATLAB

Mathematica

1. Type in the formula in Mathematica.

2. Selected the formula.

3. Right click on selection, and then select "Copy as" -> "LaTeX".

4. You can also convert formulas to other format in Mathematica.