Many software packages available through Cydia are free. Cydia "saurik" and his company, Saurik IT was also developed by Jay Freeman.
If you have jailbroken your i OS device and cannot live without your favorite jailbreak apps and tweaks then it is recommended that you avoid updating to i OS 9.3, until Pangu or the Tai G team release a tool to jailbreak i OS 9.3.
One of the golden rules of jailbreaking is to stay where you are to improve your chances of jailbreaking your i OS device.
Apple's pre-installed software packages and applications / applications directory as the only place in, will download directly to the i OS device.
Jailbreak equipment can be shut down, it is still an official from the App Store for download and general applications.
Some Jailbreaking tools (they support each specific equipment and i OS versions of), automatically install Cydia and others gives users a choice.