What is the best free software for analyzing powder XRD data?

[Amiga]

I studied an elementary course as an introduction to Solid State Physics. Now I have powder XRD data to practice crystal structure determination. I am going to do this alone in my computer. I want to know what software to use (free software) with manual of course. Any help please?

 

[Lord Jestocost]

A very powerful program is the FullProf Suite: https://www.ill.eu/sites/fullprof/

The CCP14 website might be of help, too: http://www.ccp14.ac.uk/solution/index.html