SharePoint Foundation Explorer: Free SharePoint Tool

With the SharePoint Explorer tool we can know all our SharePoint Farm structure from Farm -> Servers -> Web Applications -> Site Collections -> Sites -> Lists -> Fields.

One of the free best tool from BambooSolutions be used know hidden/custom fields. You can down load the free tool from http://community.bamboosolutions.com/ 

or can be download directly from SharePoint Analyzer V1.3