Generally the free software and open source are considered the same thing. The reason is that the two are free to download and most of the time free to use with minor stipulations, if applicable. The reality is that the free software movement and the open movement source are a little different.
Free software is software that is free in every sense of the word. Many languages have two words for free. One which means that it is free as in free of charge. The other means that it is free as in free to use and be with you please. This movement is the owner of two of these as being true. When you download a piece of free software, it costs nothing and it's free study, modify and use. The only condition is that if you make improvements, it is suggested that you share these improvements with others.
Open source is really just a model of development. You can have programs that cost money and are not free to change or to use as you please. A company could start a project to get people to join the Community code and help, but they do not allow this project package or free software. Typically, these projects eventually be the same as free software, but sometimes they are not. There is no official guidelines for what "open source" it is therefore important that you do accidentally distribute a piece of software open source which was not intended to be distributed to others.
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