Visual Studio Extensions for Windows SharePoint Services 3.0 Tools

Tools for developing custom SharePoint applications: Visual Studio project templates for Web Parts, site definitions, and list definitions; and a stand-alone utility program, the SharePoint Solution Generator.

Windows SharePoint Services 3.0 Tools: Visual Studio 2005 Extensions

Visual Studio 2008 extensions for Windows SharePoint Services 3.0

SharePoint SDK

The Microsoft Office SharePoint Server 2007 SDK contains conceptual overviews, “How Do I…?” programming tasks, developer tools, code samples, references, and an Enterprise Content Management (ECM) starter kit to guide you in developing solutions based on MOSS 2007.

Windows SharePoint Services 3.0: Software Development Kit (SDK)

SharePoint Server 2007 SDK: Software Development Kit

Microsoft Best Practices Analyzer for WSS  3.0

The Microsoft Best Practices Analyzer for Microsoft Windows SharePoint Services 3.0 and the 2007 Microsoft Office System creates detailed reports to help administrators achieve greater performance, scalability, and uptime.

SPDisposeCheck

SPDisposeCheck is a tool to help you to check your assemblies that use the SharePoint API so that you can build better code. It provides assistance in correctly disposing of certain SharePoint objects to help you follow published best practice. This tool may not show all memory leaks in your code. Further investigation is advised if you continue to experience issues.

U2U CAML Query Builder

The tool will help you build, test and execute your CAML Queries. Download U2U CAML Query Builder

SPCamlViewer

This SPCamlViewer tool will help you in viewing/writing CAML Queries.

Imtech Fields Explorer

Imtech Fields Explorer for auto generating content type-based Page Layouts and features.

SharePoint Search Service Tool

The SharePoint Search Service Tool is a rich web service client that allows a developer to explore the scopes and managed properties of a given SharePoint Search SSP, build queries in either Keyword or SQL Syntax, submit those queries and examine the raw web service results. http://www.codeplex.com/SharePointSearchServ

Search Community Toolkit

The Search Community Toolkit is comprised of a number of tools and code samples that have been contributed to enhance the Microsoft search experience. http://www.codeplex.com/sct

WSPBuilder

WSPBuilder is a SharePoint Solution Package (WSP) creation tool for WSS 3.0 & MOSS 2007.

SharePoint Solution Installer

SharePoint Solution Installer for easy deployment of WSP packages.  Download @ http://sharepointinstaller.codeplex.com/

SharePoint 2007 Features

This CodePlex project contains a number of helpful features like Debugger Feature, Log Viewer, Toolbar Manager etc. http://www.codeplex.com/features

SmartPart for SharePoint

The SharePoint web part which can host any ASP.NET web user control. Download @ http://smartpart.codeplex.com/

SPVisualDev – SharePoint Developer Tool

SPVisualDev makes it easier for Sharepoint 2007 developers to develop features and artifacts with Visual Studio 2008. It is written in C# and is implemented as a Visual Studio 2008 Add-in. http://spvisualdev.codeplex.com/

SharePoint Manager 2007

The SharePoint Manager 2007 is a SharePoint object model explorer. It enables you to browse every site on the local farm and view every property. Download SharePoint Manager2007

SmartTools

The SmartTools for SharePoint project is a collection of SharePoint extensions to make your life as a SharePoint user, developer or administrator a little bit easier! http://www.codeplex.com/smarttools

SharePoint SUSHI

SharePoint SUSHI is a powerful, user-friendly utility enabling you to accomplish common administrative tasks. http://www.codeplex.com/sushi

SharePoint Portal Server Support Report Tool (SPSReport)

The SPS Reporting Tool is utilized to gather detailed information regarding a systems current configuration. The data collected will assist the Microsoft Support Professional with fault isolation.  Download @ http://www.codeplex.com/spsreport

BDC Meta Man

http://www.lightningtools.com/bdc-meta-man/default.aspx

SharePoint 2007 Test Data Population Tool

The SharePoint 2007 Test Data Population Tool (WSSDW.exe) is a capacity planning and performance testing tool that populates data for testing SharePoint deployments. http://www.codeplex.com/sptdatapop

SharePoint Content Deployment Wizard

This tool (beta version) provides a wizard-like approach to deploying content between SharePoint sites. http://www.codeplex.com/SPDeploymentWizard

Reflector

You can find more details about here

Fiddler

Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP(S) traffic, set breakpoints, and “fiddle” with incoming or outgoing data.

Firebug

Firebug integrates with Firefox. Using firebug you can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page

Internet Explorer Developer Toolbar

The IE Developer Toolbar provides a variety of tools for quickly creating, understanding, and troubleshooting Web pages

DebugView for Windows

DebugView is an application that lets you monitor debug output on your local system, or any computer on the network that you can reach via TCP/IP. Download DebugView