You might get shocked reading this post title up there, but yes it's true! Now you can download iOS 7 for free without the necessity of having a developer account. Moreover, you can also go back to your iOS 6 whenever you feel like!
A friend of mine told me that he was able to download the iOS 7 for free and I didn't believe him. Until he shared this video with me, and actually proved to me that he downloaded iOS 7. To be honest with you, I didn't try it yet. I am waiting to fully backup my iPhone 4 and try it there. Don't want to take any risks with iPhone 5.
So, if you wish to download iOS 7 and check it out. Please watch the below video.