The Multitool plugin is an eclectic collection of tools for Indigo. The plugin uses individual plugin menu items to invoke things like "About Indigo" which prints server status information to the log, or "Object Dictionary" which prints the Indigo parameters for the selected object (action, device, etc.) There are several other tools to choose from.
More information can be found on the plugin wiki. The best page to start is probably the Menu Items page.
You can download the plugin from the Indigo Store.