This is a collection of recommended sites offering tools that are indispensable to a webmaster.
The language this site and many other dynamic sites are written in.
The world's most popular open source database.
The home of XAMPP - Apache web server, PHP and MySQL for the pc. All that you need to install and test your web applications on your home computer.
The dBpowerAMP family of audio programs. Everything you need to rip or burn cd's, play and convert between a multitude of audio file types, or manage portable audio devices. The converter is free, as is the multi-player.
A place to download free web design templates, using the latest techniques (CSS, XHTML, HTML5) and share yours with others. Seems to have been a bit abandonned though.
Google Sitemap Generator: XML-SItemaps.com
Generate XML or TXT sitemaps, appropriate for submitting to Google. Also html sitemaps for using on your own website.
Get full information on server responses for any web page, including ability to change the user agent string. Indispensable to troubleshoot, especiallay good to see contents of a cloaked hacked site.
Another comprehensive server response tool. Includes some rendering of the page and assessment of code validity.
A free tool to find malware and all sorts of malicious stuff on a website.
Swain's HTTP Viewer
A tool that lets you see accurately the data sent to the browser or to a robot by an HTTP request of any url. Indispensable for troubleshooting weird problems.
A powerful, complete, yet simple to use Windows program to crawl a website and produce Google xml sitemaps and much, much more.
Free easy to use program to find broken internal or external links and orphan files on websites. A staple tool for debugging any site.
All the Web-building tutorials you need, from basic HTML and XHTML to advanced XML, Multimedia and WAP
All the various validators, such as HTML and CSS validator, needed to ensure your web pages are as bugfree as possible, and fully compliant with the latest rules.
What we've all been waiting for, a tool to perform the W3 validation on all pages of a website. Extremely useful but it doesn't work well with html5.
Tracking visitors to and through your site is a child's play with this great free tool which offers very comprehensive stats. Beware, both the stats and the Statcounter Forum are highly addictive!
It will simulate what a typical web spider "sees" on the web page as it crawls it.
Full SEO Toolset
A comprehensive toolset for search engine optimization. Try it, you'll be amazed at what you find.
Detector for web pages
Test your web page to see if a bot may consider it spammy or not.
Check the sites you link to and the sites they link to and detect any "bad neighbourhood" tendency. Amazingly accurate. Find evidence of hacked serevrs and sites that way too.
Powerfull tool to find other web pages with substantially the same content as yours.
This will analyze a web page's contents and produe a speed of loading report and show warnings for whatever may cause slow downs.