List of development tools for SharePoint
CKSDev
SharePoint Developer Dashboard
From SharePoint 2010 Management Shell on the WFE:
$webSvc =[Microsoft.SharePoint.Administration.SPWebService]::ContentService
$webSvc.CollectSPRequestAllocationCallStacks = ‘True’
$webSvc.Update()
$webSvc.DeveloperDashboardSettings.EnableDiagnosticMode()
After this runs, you will see a green icon at the top right corner of the page. Click the green icon to view query statistics, server information, user information, etc.