Plugins that start with the letter R, are Commercial and are sorted by Entry Date.
Allows the user to simulate repeating events. When used in a template, Repeet tags display EE weblog entries as though they repeat at an interval set by the author.
ExpressionEngine 1.x, ExpressionEngine 2
Random Number allows you to output random numbers.
Basically if you place this into a template then you will be re-directed to the URL specified in the location parameter.