pick ur tool:

http://www.econsultant.com/i-want-freeware-utilities/index.html
http://www.hanselman.com/blog/ScottHanselmans2005UltimateDeveloperAndPowerUsersToolList.aspx http://members.ozemail.com.au/~nulifetv/freezip/freeware/
http://www.sellsbrothers.com/tools/
https://addons.mozilla.org/firefox/216/ (also take a look at all the other extentions)

Tyred of the loading time of adobe pdfreader? Supersmall, superfast and free: foxitreader. Heard about it during a podcast but forgot about it until it showed up on the lists above.
http://www.foxitsoftware.com/pdf/rd_intro.php

GhostDoc is a free add-in for Visual Studio that automatically generates XMLdocumentation comments. Either by using existing documentation inheritedfrom base classes or implemented interfaces, or by deducing comments fromname and type of e.g. methods, properties or parameters.
http://www.roland-weigelt.de/ghostdoc/

Tools for unit testing
Tools for code and documentation management and generation
Tools for modifying the development environment
Tools for working with data
http://msdn.microsoft.com/msdnmag/issues/05/12/VisualStudioAddins/default.aspx

Snippy - Visual Studio Code Snippet Editor
http://www.gotdotnet.com/codegallery/codegallery.aspx?id=b0813ae7-466a-43c2-b2ad-f87e4ee6bc39

snippets addin codekeep
http://www.codekeep.net/addins.aspx (yes, with vs2005 version also!!!)

Here are listed some of the existing companion tools for .NET development. We put the focus on the quality of the content. Boring marketing fluff is filtered out.
http://sharptoolbox.com/

ASP.NET Development Helper is a utility for ASP.NET page and control developers that plugs into Internet Explorer. It allows viewing information about the current page such as view state and trace, perform some operations on the server in the context of the running application to aid testing, and also allows monitoring requests and responses for diagnostic scenarios.
http://www.nikhilk.net/Project.WebDevHelper.aspx

WSCF - Schema-Based Contract-First Web Services
A Free Visual Studio Add-In and Command Line Tool for ImprovedSchema-Based Contract-First Web Services Design and Programming
thinktecture WSCF

TestDriven.NET makes it easy to run unit tests with a single click, anywhere in your Visual Studio solutions. It supports all versions of Microsoft Visual Studio .NET
TestDriven.NET 2.0

Tools and source code for .NET, C#, Visual Basic and WinFX. Reflector is a popular class browser. Resourcer is a .NET resource editor.
Lutz Roeder's .NET Reflector

Doubler is a code generator that makes unit testing easier. It is especially useful when working with legacy code. It is a Reflector add-in, a tool already woven into your workflow. It will help you cleave dependencies apart, create test doubles, and write unit tests with little effort and less coding.

http://jayflowers.com/doku/doku.php?id=doubler

VS2005 tool to help simplifies the process of installing and uninstalling controls from VS2005

http://www.codeproject.com/useritems/VisualStudio2005Toolbox.asp

Internet Explorer Developer Toolbar Beta 2 Preview Update
Download

Keep track of what u where doing. (Takes screenshots)
http://www.timesnapper.com/

Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler is designed to be much simpler than using NetMon or Achilles, and includes a simple but powerful JScript.NET event-based scripting subsystem.

http://www.fiddlertool.com/fiddler/

Small tool which allows you to edit a resource file outside Visual Studio. Well, writing ur own would take about 40 min, but whatever, its free..Only drawback, when you give this tool to your client, he/she has to have the 2.0 framework installed.
http://www.peoplewords.com/download/ResxEditor.aspx