UrlCrazy is for the study of domainname typos and URL hijacking. It generates domainname typo permutations then tests them to learn if they are in use, estimates their popularity and more. Typo types supported are: Character Omission, Adjacent Character Swap, Adjacent Character Replacement, Adjacent Character Insertion, Missing Dot, Strip Dashes, Singular or Pluralise. Urlcrazy is written in Ruby.
You can download it from the following link: https://packetstormsecurity.com/files/download/76243/urlcrazy-0.2.tar.gz
Source: https://packetstormsecurity.com/files/76243/URLCrazy-Domain-Name-Typo-Tool-0.2.html