You can jailbreak your iPhone 4. iPhone 3GS, iPad, iPod Touch 3G and iPod Touch 4G by using this tool. Greenpois0n tool is now available for Windows, Mac and Linux. The Chronic Dev Team gives you this tool as free.
Greenpoison versions are available for below iDevices
Absinthe 4 for Apple A5 devices on 5.0.1
Corona for Apple A4 devices on 5.0.1
RC6.1 for iOS firmware 4.2.1
for iOS firmware 4.1
You can jailbreak your iDevice’s firmware running iOS 4.1 witih this tool. latest version of this tool is GreenPois0n RC6.1. It is available for both Windows and Mac download. Here are the download links for RC 6.1.
For Windows users
For Mac users.
This tool is the one click solution for your iDevices to download and install Cydia.