FAST Search Explorer Tool
http://fastforsharepoint.codeplex.com/
Master Pages Developer Tool for SharePoint 2010
http://startermasterpages.codeplex.com/
SharePoint Dispose Checker Tool
http://archive.msdn.microsoft.com/SPDisposeCheck
SharePoint Warmup Job utility
SharePoint 2010 Administration Toolkit
http://technet.microsoft.com/en-us/library/cc508851.aspx
