Theos?
Theos is a cross-platform suite of development tools for managing, developing, and deploying iOS software without the use of Xcode. It is an important tool for people building extensions (tweaks) for jailbroken iOS; most extension devlopers use Theos. Reference: http://iphonedevwiki.net/index.php/Theos
A Up To Date Video Tutorial on how to install Theos on your Jailbroken IDevice
