The resources that are highlighted below are used by most of the UX consultants in making stunning application that amazes you.Let us have a look at each one of it in some depth.Even you can try some of them free of cost.
Card Sorting tool —> http://www.optimalsort.com
Ever you got intrested to decide Information Architecture of an application.You can easily perform card sorting using Optimal sort.The website allows you to make a free account & perform online card sorting.
Eye tracking stimulator —> http://about.stompernet.com/scrutinizer
The Scrutinizer is a web browser, based upon the Adobe AIR toolkit and the WebKit browser, that offers a simulation of the human visual system. Using this simulation, you can get a better idea of how users interact with your site design.The Scrutinizer browser applies a visual filter to where the mouse is located, simulating foveal vision centered around the mouse.The parts away from the mouse will be deteriorated into lower resolution, both in detail and color.
Keyword suggestion tool —> http://freekeywords.wordtracker.com/keyword-suggestion-tool.html
Keywords are most important to make the site search engine friendly.Reseach shows that 60% of the users reach the websites by search engines, this makes the Keywords to be used on the webpages more important. Use the keyword suggestion tool to make your web pages search engine friendly.
Page ranking checking tool —> http://www.prcheckingtool.com/
This tool will check 30 different Google data centers and generate Google Pagerank (PR) for your website. This is also a good tool to try an predict your future pagerank as some data centers may display your PR sooner than the real toolbar
Website task management tool —> http://www.taskee.com
Taskee is a hosted website task management tool for small and medium size webdesign companies. Taskee simplifies website task management communication process and makes it easier and cheaper to collaborate during website testing process.
Visitor heat map tool —> http://crazyegg.com/
This is a wonderful tool, it makes you aware what the users are doing on your website.It generates Heat map about the user actions on your webpages.The mouse clicks on the webpages are shown as heat maps.The analysis can go deeper than this based on Search Terms, Operating System, Browser, etc…etc.Have a look at it, it's amazing.
Webrecorder tool —> http://www.dejaclick.com/
Web recorder is a free utility designed exclusively for Firefox. It helps you to bookmark multi-step recording.You can download it for free.
Mouse gesture tool —> http://www.gmdw.com/capstone/
This is a great effort from Sameul Goldwyn in using mouse as a usability testing tool.The mouse is like a fingerprint that shows the user's most intrested content on the web page.
Web accessibility check —> http://www.accesskeys.org/tools/color-contrast.html
AccessColor tests the color contrast and color brightness between the foreground and background of all elements in the DOM to make sure that the contrast is high enough for people with visual impairments. The accessibility of the pages can be checked by entering the url of pages.
W3C markup validation check —> http://validator.w3.org/
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.
Font collections —> http://www.dafont.com/
A good collection of fonts.
Most of the tools stated above give you a free account to try & even let you work on small projects.