Keeping these links for future references:
1. EnjoyCSS - an advanced CSS3 generator that saves your time. Its handy and simple UI allows you to adjust rich graphical styles quickly and without coding.
2. ComSlider - Free Online jQuery Slider, jQuery Slideshow Gallery. Fancy transition and visual effects, templates. No coding, no image editing, no learning curve, no software to download, no jQuery conflict.
3. Typetester - an online application for comparing how different fonts and font attributes will appear on a given set of text.
4. pForm - create a php form in seconds with this free and easy to use tool.
5. ColourLovers - An international site created for color lovers. You can search the site for color palettes that you may use for projects or create new palettes which can be rated by peers.
6. HTML Entity Character Lookup - searches the htmlentities for matches to the searched character based on how the character looks.
7. 960 Grid System - an effort to streamline web development workflow by providing commonly used dimensions, based on a width of 960 pixels.
8. Em Calculator - a small JavaScript tool which allows you to enter a size in pixels and displays what the corresponding em value would be.
9. Browser Shots - allows you to view your website in around 100 different browsers on 4 different platforms to determine the ultimate cross browser support
10. Icon Finder - provides high quality icons for web designers and developers in an easy and efficient way.
11. WhatTheFont - want to know the font that your favorite blog uses, this tool can help you.
12. MeasureIt - A great Firefox plugin that lets you draw out a ruler to get the pixel width and height of any elements on a webpage.
13. ColorZilla - get a color reading from any point in your browser, quickly adjust this color and paste it into another program.
14. Pingdom - loads a complete HTML page including all objects (images, CSS, JavaScripts, RSS, Flash and frames/iframes). It mimics the way a page is loadedin a web browser and then displays how long each of those elements took to load using nice visual time bars.
15. Test Everything - lets you run your website though approx. 100 different validators and testers, all from the comfort of one application.
16. CSS Sprite Generator
17. Web Developer Toolbar - extremely useful Firefox plugin which provides many tools which web developers use on a daily basis.
18. Domainr - tell you whether a domain is taken or not.
19. Font Burner - a free online tool that allows you to search through over 1000 fonts they have available.
20. Smush.It - a neat application which uses non-lossy image optimization tools to squeeze the last bytes out of your images.
21. Load Impact - a free tool which tests your site at different load levels and then displays your results in an easy to understand graph.
Reference: http://code.tutsplus.com/articles/20-tools-to-make-the-life-of-a-web-developer-easier--net-5338