You can run OpenMx on computers using Windows XP/Vista/7, Mac (Intel or PPC) OS-X 10.5 or later, and varieties of Linux (32 and 64 bit).
In order to install OpenMx, you will need R version 2.9.x or higher. Unfortunately there is a bug in version 2.10.0 that prevents the use of our automatic installer. We recommend users of R 2.10.0 to upgrade to version 2.10.1 or higher.
If you need to download R, it can be found at CRAN .
Next, open up an R session and copy the following line into the R command line and press return.
If you don't have a default CRAN repository, you will be prompted to pick one. Just pick a repository near you and press the OK button. If you do have a default CRAN repository, you won't see that panel.
A few lines of R output will scroll by and you will be asked which type of OpenMx Installation you would like. Unless you are a Mac OS 10.7 users choose the default 'multithreaded' installation option and your OpenMx library will be installed. If you are using Mac OS 10.7 and have not installed the macports version of gcc , choose the 'sequential' installation option.
Now you should be ready to take a look at the Tutorial User Guide .
Take a look at third party software  that extends the functionality of OpenMx.
If you are interested in building OpenMx from source, take a look at the OpenMx Compilation How-To Guide .