A list of useful tools for managing SharePoint.
SharePoint Manager 2013 (2010)
The SharePoint Manager 2013 is a SharePoint object model explorer. It enables you to browse every site on the local farm and view every property.
SharePoint 2010 Version: http://spm.codeplex.com/downloads/get/526736
Stramit SharePoint Caml Viewer
Tool to help you write a correct CAML Query.
SharePoint CAML Query Helper
Use this program to help build and test SharePoint CAML Queries (Collaborative Application Markup Language). Compatible with WSS 3.0, MOSS 2007, Foundation 2010, SharePoint 2010, and now SharePoint 2013.
SPServices is a jQuery library which abstracts SharePoint's Web Services and makes them easier to use. It also includes functions which use the various Web Service operations to provide more useful (and cool) capabilities. It works entirely client side and requires no server install.