Hi, I released RPN2TeX Web edition. RPN2TeX enables us to input TeX equations with RPN(Reverse Polish Notation) which is an input method that is used in HP calculators. RPN2TeX webpage: http://cacao.homeunix.org/RPN2TeX/ If you have any feedback, please feel free to write to me. MAEDA Wataru wataru at e-mail.ne.jp