In our ongoing effort to assist aspiring and current webmasters alike, below you'll find a list of sites that offer a variety of resources and assistance. If you've found use from any of these sites, be sure to click the button. Feel free to respond if you have any questions, testimonials, or additional tips for these sites.
What CMS
WhatCMS.org looks at a variety of factors within a webpage to determine what Content Management System (CMS) a website is using, but be aware that it is not 100% accurate. Save yourself sometime and simply enter the URL of the site you're interested in learning more about, and you should see a result indicating the software being utilized, often with a link to the source.
Which CMS
WhichCMS.org can help you narrow your preferred CMS search via a filtered list of features.
WP Theme Detector
If you guess that a site you like uses WordPress, head over to WPThemeDetector.com, enter the site's URL and click the green button. The WPTD tool will analyze the site for you and will display a wealth of information about the WordPress theme and plugins being used.
IconFinder
Iconfinder.com provides beautiful icons to millions of designers and developers. Icon Finder now hosts the worlds largest collection of premium icons. Search through 395,000+ icons or browse 4,100+ icon sets.
IconArchive
IconArchive.com allows you to search through more than 550,000 free icons. Browse icons by category, artist, popularity, date. Organize and share your favorites.
JS Beautifier
JSBeautifier.org will beautify, unpack or deobfuscate JavaScript and HTML; also makes JSON/JSONP readable.
W3C Markup Validator
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. Validator.w3.org