It rotates content. Namely, ten different contents, anywhere you wish on your page. If you look more closely, you would see that the links change dynamically, there is ten sets of them, each set displayed on 1/10th of the pages.
Say you have an empty space on your forum, you would like to place some text there, but don't want it to be the same on every page. This plugin will allow you to have ten different texts. For the topics that have number ending with 1, the text number 1 will be displayed, for topics xxx2, it will be text no. 2, and so on.
Sorry but I am not sure whether I will be able, with my level of English, to explain beyond what is in this thread and in the readme file. I guess this plugin is not for everybody, but some people will find it useful.