GeekSnow is a jailbreak tool that can be used with iOS 8.4.1, and you should know that it currently doesn`t work on devices running on the A4 chip.
The installation procedure is quite easy and won`t require a lot of system resources. You must have .NET Framework, and the latest iTunes installed on your computer to install it. GeekSnow needs you to run it as an administrator.
You must connect your device to your PC through a USB cable and enter the DFU mode. You can click on the JAILBREAK button and give some time to finish the jailbreak.
It also has some additional features which you may find useful, such as the Auto-Hacktivation for locked iPhones and the auto-detect feature which this app uses to identify your phone.
The jailbreak process goes pretty smoothly. The simple-to-use interface is well made, and any user can easily understand it if he decides to use this jailbreak.
GeekSnow is available for free, and any user can use it to jailbreak their device.