Periodic workflow rule execution
CRM has a great workflow engine, this allows users to create their own business logic in a fairly simple web based editor. These rules can be started on a variety of event, such as the creation and/or update of a record. However no mechanism is available to run rules periodically.
This simple tool allows you to run a workflow rule periodically on the result set of an advanced find query. This provides a simple and effective mechanism which doesn't require custom coding.
The source code of this tool is also available.

Download the latest version
here.