Whatsapp application is an instant messaging software, that allows you to get in touch with anyone for free. Read how to fix the push notifications error!
Tweetbot is a mobile application that allows you to use Twitter to your iDevice, and there are special versions for your iPhone, iPad and iPod Touch.
PKGBackup application allows you to create a backup of ALL your Jailbroken apps with their configuration and settings, so you can later load them to your device.
Activator App can only be found on Cydia, which means that its installation and use requires a jailbroken iDevice. Activator App was created by Ryan Petrich
iFile can be found on Cydia which means that you need to have a jailbroken iDevice. iFile is considered to be the best file manager you can get for iDevices.