The win32-taskscheduler library provides an interface to the MS Windows Task Scheduler. With this interface you can create new scheduled tasks, configure existing tasks, or delete tasks.

The attempt library provides a thin wrapper for the typical begin/rescue/sleep/retry dance. Use this in order to robustly handle blocks of code that could briefly flake out, such as an http or database connection, where it's often better to try again after a brief period rather than fail immediately.

The html-table library provides an interface for generating HTML tables in a syntax comfortable to Ruby programmers, but with some enforcement of where certain elements can be placed.

The use library solves the multi-mixin problem by allowing you to selectively mixin specific methods from a module rather than mixing in all of them. In addition, you can alias methods on the fly as they are mixed in, effectively allowing you to change the name of the mixin method.