No free softwares are available for RSM. But, evaluation versions are available for academia.

Dear Roselette,  Good Morning.

The RSM package is available from the Comprehensive R.  From the below link:

http://CRAN.R-project.org/package=rsm.

Kindly see the attachment for your future help.

Thanks.

You can try Design Expert, its free for few month as trial

Thank you all.

Shashi Bhatia, yes, I have tried the trial version of Design Expert. I probably will use that or the link provided by Senthilvel Vasudevan.

Thanks again.

Can you help me for the link download for design expert ? Thank you.

Bhatara Ayi Meata, I only googled Design Expert. I believe it will lead you to their website. You can download the trial version for free.

You can also use minitab.

minitab for this purpose is good

Statgraphics

Statistica

Matlab

Sas jmp