Windows 7 is an operating system developed by Microsoft as part of the Windows NT family. It was released to the public on October 22, 2009. The "SP0" in your query refers to Service Pack 0, which means this is the original release of Windows 7, without any service packs applied.
Yes, there are several free alternatives, including various Linux distributions like Ubuntu, Fedora, and Debian, which offer similar functionalities without the cost. windows 7 sp0 x64 build 617600 full version link
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