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Open Source means that the source code is open for modification and to learn the design of it but that dosenot mean that it is free not all open source is free ex: redhat
Free Source i donot know if this term is write but i think it is a free computer software that is distributed along with its source code, and is released under terms that guarantee users the freedom to study, adapt/modify, and distribute the software....read about GNU
Free software movement was aimed at advocating the availability of free source codes and removal of copyrights. Also, whatever codes are derived from a free software license should also be released as free software. This posed a major problem in the commercialization of products. OSS which was initially introduced to remove the confusion caused by the ”free” term took up the cause of removing the restrictions placed on commercialization. Codes under open source license can be used and modified, like free software, but the modified by-products do not have to be under the open source license. This helped in the commercialization of products produced using open source software. But since that was against what free software stood for, it separated the two into two different concepts. Thus free software was a movement that emphasized on the moral aspect of the availability of free codes and promoted intellectual freedom. But OSS was a practical solution to allow the business use of free codes. So, in a way, open source codes can be used for free software but the reverse causes a conflict.
I think you mean Freeware/Free Software by the word 'Free Source".
However, an Open source software is software that you can get it at free cost and you can develop/upgrade and chage.
A freeware is a software that you can get at zero cost but you can't develop or change.
From the following link you can get more details:
http://blog.freeloaderdirectory.com/2009/07/open-source-vs-freeware/