Actually we can find many Youtube videos for iPod Nano jailbreak. Normally free best Jailbreak tools  are Evasi0n, Redsn0w, Sn0wbreeze, P0sixspwn, Absinthe.

If your device is running with iOS 7 use - Evasi0n

If your device is running with iOS 6 use - Evasi0n

If your device is running with iOS 5 use - Redsn0w , Absinthe

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