Sogol
Math Assistant and Hypertext Notepad for Engineers and Scientists using Windows. Assists with calculating networks of formulae, dynamic simulations, equation solutions, differential, multiple equations and unknowns, with built-in script language. Useful for engineering and scientific... User acquires or creates application files called webs to solve particular problems of interest.
http://www.codelode.com/Sogol/SOGOL12.exe - 1Mb - Download - Screenshot

pSogol
Math Asst. , Calculator, and Hypertext Notepad for Scientists and Engineers using Pocket PC 2003. Assists with calculating networks of formulae, dynamic simulation, differential and linear equation solution, multiple equations and unknowns, builtin script language. ... User acquires or creates application files called webs to solve particular problems of interest. ... Useful for engineering and science computations, trying out algorithms, plotting results, quantitative brain-storming, and documenting problem solutions.
http://www.codelode.com/Sogol/pSogol/PSOGOL12.exe - 2Mb - Download - Screenshot