Development

Vi Improved (Vim)

http://www.vim.org/

Light text editor with syntax highlighting, find and replace with regular expressions, and many other features. Its use is quite complex for new users.

WinMerge

http://winmerge.org/

Shows very clearly the differences between two text files.

Fiddler Web Debugging Proxy

http://www.fiddler2.com/fiddler2/

Proxy displaying all HTTP and FTP requests sent from the computer. Ease the debugging of POST requests, AJAX, etc ... Shows among other things the HTTP headers, the return code from the server, session information, etc... This is a useful tool for AJAX development with Internet Explorer.

IETester

http://www.my-debugbar.com/wiki/IETester/HomePage

Test the visual aspect of a website with different versions of Internet Explorer (5.5, 6, 7, 8).

Speed Limiter

http://www.delight.ch/de/speedlimiter/downloads

Simulates varied connections speeds from your high speed Interent line. Enable to test the display of websites through 56k connections.

Xenu's Link Sleuth

http://home.snafu.de/tilman/xenulink.html

Search a website for broken links, duplicate content, heavy pages, or pages with a lot of external links.

Plagiarism Checker

http://plagiarisma.net/

Check for duplicate content.

Tortoise CVS

http://www.tortoisecvs.org/

Add a CVS client to Windows Explorer.

Tortoise SVN

http://tortoisesvn.net/

Add a SVN client to Windows Explorer.

Inno Setup

http://www.jrsoftware.org/isinfo.php

Simply creates software installers.

PuTTY

http://www.chiark.greenend.org.uk/~sgtatham/putty/

Client SSH (Unix) for Microsoft Windows.

WinSCP

http://winscp.net/eng/docs/start

Client SFTP (scp) for Microsoft Windows.

Barres d'outils Internet Explorer

Internet Explorer Developer Toolbar

http://www.microsoft.com/download/en/details.aspx?id=18359

Provides some advanced CSS and DOM inspection tools for web pages.

DebugBar

http://www.debugbar.com/

Provides many DOM and CSS Inspection tools for web pages.

Script Debugger for Windows NT 4.0 and later

http://www.microsoft.com/download/en/details.aspx?id=22185

Advanced Javascript debugger for Internet Explorer.

Web Accessibility Toolbar

http://www.visionaustralia.org.au/ais/toolbar/

Check a website for accessibility errors. Include a contrast measurement tool.