WinMopac7.21 is a powerful tool for semi empirical calculations of chemical molecules. This program has unified old DOS version MOPAC7 with some improvements which we have made and a convenient windows interface, and an integrated external molecular viewer(RasWin). The Windows interface includes all editing functions, a setting menu and some other features...

WinMopac7.21 is created by Roman Shchepin and Dmitriy Litvinov. We are especially thankful to Mikhail Andronov and Mikhail Shklyaev for his useful pieces of advise.

Copyright

       WinMopac7.21 is a FREEware which means that you can use it as long as you need to make as many copies as you want and freely distribute it, provided that all the files are included and are unmodified and that no files have been added to the package. Please, distribute it by copying the original self-extracting archive file. You may NOT ask any money for the distribution. Also, we need to mention that mopac.exe file is not our property, it belongs to the U.S. government. Therefore, mopac.exe may be modified. For more information on history of MOPAC and on copyright status of mopac.exe you can download mopac.man file from the our web site.
       RasWin is a molecular graphics program. Its sources of code are available for noncommercial use. Therefore, anybody can make changes in those sources of code and recompile them.
       However, you may NOT attempt to reverse compile, modify, translate or disassemble any parts of the software except mopac.exe. NOTE, that if you have modified mopac.exe , you may NOT distribute it as part of our program package any longer. If you want to put this component on a freeware/shareware CD-ROM or an other compilation, please, contact us before doing so, to be sure that you are not including old or incomplete stuff in the compilation. We would also appreciate it if we could get a free copy of the CD-ROM.
       This software is provided "as it is". In no event we, the authors, shall be liable for any consequential, special, incidental or indirect damages of any kind arising out of the delivery, performance or use of this software. This software has been written with great care but I do not warrant that the software is error-free. If you find any "bugs" or you have some suggestions, please, contact us. E-mail: winmopac@psu.ru
       We hope you'll enjoy using our program.

Here you can download our program: WinMopac7.21

Mirrors:
http://winmopac.narod.ru (Russia)
http://www.mysiteinc.com/winmopac/ (USA)
http://members.fortunecity.com/winmopac/ (USA)

See below a list of free programs
which can be used together with WinMopac7.21:

1) ACD labs "ChemFolder" can be used for drawing of molecular structures and saving them as MLD mol files. In order to convert MLD mol files into Mopac Internal format, the combination "Babel" and "BabelWin" can be used. These matrixes can be opened by our program. When calculations are completed, Final Matrixes can be converted back into the MLD mol format and then viewed by the same ACD viewer. ACD labs "ChemFolder" can be obtained from: http://www.acdlabs.com/download, registration is free.

"Babel" and "BabelWin" can obtained right from our web site:

Babel version 1.06 by Pat Walters and Matt Stahl - babel.zip
BabelWin by Dr. Jeffrey.J. Grosper and Mahmood Bhimji babelwin.zip

2) Our second suggestion is "RasWin" by Roger Sayle. This program can view Mopac Internal files directly and it is downloadable right from our site - raswin.zip
Though, "RasWin" is included in WinMopac 7.21.

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