MS Windows

A site which has links to hundreds of free programs gathered in one spot. Some have all the functionality of programs that cost thousands of dollars.

ACD Labs graciously make available a non-trivial chemical drawing program and a number of plug-ins. A handy program to draw polymers and chemical reactions. ACD Labs is a Toronto (Canada) based company that produces many advanced chemical programs.

MDL Chime is chemical structure visualization plug-in for Internet Explorer and Netscape Communicator. Draw structures with ISIS/Draw and visualize them in 2D or 3D. MDL develops applications for managing chemical, databases and software technology for informatics solutions

is a freeware two-dimensional molecule drawing program for Windows 95/98/NT/2000/XP. It is similar in functionality to other molecule drawing programs such as ChemDraw (TM, CambridgeSoft). It can read and write MDL Molfiles to allow sharing between XDrawChem and other chemistry applications, as well as read ChemDraw binary and text files.


Many sites offer links to scientific software, for instance the Silicon Valley Linux Users Group or the Scientific Applications on Linux site. Nevertheless, some valuable engineering software remain mostly unpublicized.


Scilab is a free software package for numerical computations based on matrix computations. It uses a command language compatible with Matlab. Scilab includes hundreds of mathematical functions with the possibility to add interactively programs from various languages (C, Fortran...). It has sophisticated data structures (including lists, polynomials, rational functions, linear systems...), an interpreter and a high level programming language. A very powerful gift from Paris (France).


PHYSICA is a high level, interactive program with graphics and mathematical analysis capabilities. It provides all of the operations of simple calculus, along with powerful curve fitting, filtering and smoothing techniques, and employing a dynamic array management scheme allowing arrays limited in size only by system resources. The command language is a structured programming language including conditional branching, looping and subroutine. Algebraic expressions of arbitrary complexity can be evaluated. A high power gift from Vancouver (Canada) with an extensive user's guide.

  • Arbitrary Transmission Line Calculator (for electrical transmission lines)
  • atlc is a computer aided design (CAD) package for the design and analysis of electrical transmission lines and directional couplers of totally arbitrary cross section. By analysis, it is assumed one requires finding the electrical properties of transmission lines or couplers, where the physical dimensions are known. By design, it is assumed one requires a transmission line or coupler to have certain electrical properties and one wishes to find how to physically realise such a structure.


    XDrawChem is a two-dimensional molecule drawing program for Unix operating systems. It is similar in functionality to other molecule drawing programs such as ChemDraw (TM, CambridgeSoft). It can read and write MDL Molfiles, and read ChemDraw text and binary files, to allow sharing between WinDrawChem and other chemistry applications, and it can create images in popular formats like PNG and EPS. XDrawChem has been tested on Linux, Mac OS X, SGI IRIX 6.5, Sun Solaris



    EasyCalc has all the functions you would expect on a full featured scientific calculator. It has graphing capability (normal, polar and parametric), function solving (fzero), complex numbers, matrix operations, unlimited number of variables and functions, hex, decimal, binary or octal computing modes. It is capable of handling a number of variables and functions limited only by memory capacity. In addition there are versions in english, french, german, spanish, italian, portuguese, russian and tcheck


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