We offer ASReml-SA as a standalone package or ASReml-R for use within the R environment.
ASReml-SA (standalone) uses a text file user interface and can access more work-space, making it useful for very large problems. ASReml-R is convenient for regular users of the R environment and it is easier to manipulate data.
Both are powerful tools for fitting mixed models and are based on the same computational core, although new developments occur first in the standalone version.