NONE, just pay for it and you'll love it!
Although I LOVE the paid version of minecraft and feel obligated to promote buying it, I understand the fact that you want a free version. The version I got before buying it was from thepiratebay.org. Just search "Minecraft" and it will find multiple ones for you to choose from.
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You can play the demo or you can go onto a site (not reccomended) and download it there for free.
Do not answer this question. This person will get into your account and download mine craft free.
Google for Mineshafter. That is a free alternative to official minecraft services.
Technically, anyone can download Minecraft for free from Minecraft's website; however, you can only play Minecraft if you purchase an account.
no you can download any mod for free, well at least all the ones i know