In the jailbreak world, a "repo" (repository) is the URL you add to your package manager (Cydia, Zebra, Sileo) to download software. Because CrackTool is a piracy-related utility, it is never hosted on "BigBoss" or other official default repos.
CrackTool 5 is a specialized app for jailbroken iPhones and iPads. Its primary function is to act as a "cracker" for premium Cydia or Sileo tweaks. Many developers offer their software for a fee; CrackTool attempts to modify the code of those tweaks locally on your device to make them believe a legitimate license has been purchased. Finding the "Hot" Repos cracktool 5 repo hot
When official sources go down, third-party mirrors often host the .deb files. In the jailbreak world, a "repo" (repository) is