Router Password Kracker is free software to recover the lost password of your router.
It can also be used to recover passwords from your internet modem or websites which are protected by HTTP BASIC Authentication.
Generally, Routers or Modems control their access by using HTTP BASIC authentication mechanism. In simple words, when you connect to your Modem/Router from the browser (typically http://192.168.1.1) you will be asked to enter username & password. If you ever forget this password, then you will not be able to access your Router/Modem configuration. Even some websites use this BASIC Authentication to allow only certain users to access their site.
Router Password Kracker uses simple dictionary based password recovery technique. By default, it comes with sample dictionary file suitable for Routers.