An extensive, customisable, fully featured user tracking plugin.
Upon installing this plugin you need to realise that you are potentially logging a lot of sensitive information on your users. You accept that by installing this plugin you are accepting not to misuse or abuse this data in any way. I will not take responsibility of any case of misuse of data caused by this plugin. That is the sole responsibility of the person who installed the plugin.
This plugin uses software developed and maintained by Gary Keith. He allows this plugin to check for updates on his site once a week. If this condition is violated by you (which requires manual editing of the code, there is no other way) then it is possible that you will be banned from accessing his website.