Evasi0n is the famous jailbreak tool that was released to jailbreak iOS 7 on iPad Air, iPad 4, iPad 3, iPad 2, or iPad mini on iOS 7.0 to iOS 7.0.6. If you are still having that older version on your device and you are willing to jailbreak using Evasi0n tool, you can download from below links and enjoy free iOS 7 jailbreaking.

Evasi0n7 1.0.8 (Windows): [Mirror 1] [Mirror 2]
Evasi0n7 1.0.8 (Mac): [Mirror 1] [Mirror 2]