I use and highly recommend QDA Miner, it has a free option and is fairly intuitive:

https://provalisresearch.com/products/qualitative-data-analysis-software/

Atlas TI has a free trial version not limited by time of use, but by number of quotations and files

http://atlasti.com/free-trial-version/

Nvivo is a very usefull and easy to use software. It gives you about a month for free to try it out.

I also recommend the free version of QDA Miner, which will do all the basic tasks, such as coding and retrieving text segments.

Thanks everyone! I wanted to get a free software, so I guess QDA will do the job. Thanks.

I've supported the use of several free stand alone software.

For simple projects I've used the CDC's Ez-Text: http://www.cdc-eztext.com/

CDC also has a free platform for multiple raters: AnSWR http://www.cdc.gov/hiv/software/answr.htm

Probably the most power full is the qualitative package for R.

R is open source statistical software with 'add-ons' for specific projects.

You can access the basic R package (and need to do this first) at:

https://cran.r-project.org/

I added on the QCA: Qualitative Comparative Analysis package:

https://cran.r-project.org/web/packages/QCA/index.html

There is a nice presentation on how to use the R platform for qualitative analysis at: http://comm.eval.org/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=4bc47744-23e2-445f-90e1-f1ad8b6ec30b