Edit and visualize JSON.
Find out what your browser size is.
Compress and gzip your CSS and JS.
Another option for generating grids.
Reorder your CSS properties as you please.
Quick access to major online brand colors.
Get your noise! Supplies limited! Fresh noise here!
Apparently, CSS has a color named “YellowGreen”. As well as 146 others.
Get a unique URL that shows every request made to it.
An advanced placeholder text generator that fills in names and cities.
Search and download across many free UI resources sites.
Create and edit wireframes online.
Interactive cross-browser testing.
Merge and diff files online.
Like The Toolbox, but for jQuery plugins.
A handy CSS3 reference with live examples.
Test your website’s performance and get a nice graph.
Create color ramps for pixel art.
Advanced lossy compression for PNG images
Generate redirect codes for your .htaccess files.
Extract a CSS gradient from any image.
Create and test regular expressions.
Make HTTP requests with custom parameters and headers.
Generate and customize QR Codes.
A powerful online editor supporting HAML, SASS, Coffeescript, and more.
Write and run Ruby code in your browser.
Another useful CSS3 generator.
Another good option to test your design at multiple sizes.
Auto-crop images in multiple sizes.
Generate an @font-face-compatible font from a font file.
Ultra-minimalist color picker.
Another tool that will explain why your site is painfully slow.
Write and test XML and XSLT online.
By popular demand: Adobe’s well-known color picking tool.
Get the weather with a sweeet UI.
This tool lets you combine multiple effects to create complex pure CSS objects.
Quickly add various browser chrome frames to any image
A search engine for public domaine images.
Helps you set your type for optimum readability.
A collection of free CSS snippets from around the web.
This site will put you at ease. Get it? At ease?
Pixelate images and combine multiple effects.
Helps you generate common CSS3 rules.
A simple scientific calculator.
Find out what the time is, here and elsewhere.
This creatively named site lets you build animated gifs from separate images.
A collection of free, coded HTML5/CSS user interface snippets.
Quickly set up one-question surveys.
A search engine for free vectors and photos.
Test how long a page takes to load.
Generate various color schemes from a single color.
Generate a blank stylesheet skeletons from an HTML file.
Convert a color to HSL, RGB, etc. and get more info about it.
Get the HTML/CSS code for text written along a custom path.
Generate HTML5 starting templates for your new projects.
A repository of public and private code snippets.
Display a word in every font you have on your system.
View a site in multiple sizes, even including a mobile UI overlay.
Specify the total width and number of columns, and get different options for column width and gutters.
Create invoices instantly, without even needing to sign up.
A nifty tool to keep track of the time in different places.
Handy charts showing which features are compatible with which browser.
This regular expression tool includes a reference and pre-made snippets.
A nice HTML entities (special characters) reference
Another nice tool to help you write regular expressions.
Oldie but goodie: the CSS3 generator lets you (what else) generate CSS3.
Create stripe patterns with multiple layers.
Get placeholder images in any size, for any occasion.
Compress your JPEG images without losing (too much) quality.
Image compression tool that works with JPEGs, GIFs, and PNGs.
A collection of UX/UI examples from various Android apps.
Generate sprite sheets by drag-and-dropping images.
A collection of mobile app screenshots, organized by interaction patterns.
Write and test Regular Expressions, also includes a handy reference.
A gallery of mobile user interfaces organized by interaction patterns.
Look up advanced HTML5 and CSS3 features and find out which browsers support them (hint: not IE).
A great source for animated spinners and various loading gifs.
Get color variations from a single color.
Advanced CSS easing animation tool.
Brush up on your CSS selectors with live examples.
Find a unicode character simply by drawing its shape.
Generate placeholder images just with an URL.
Helps you build a date & time string with the appropriate symbols.
Generate a color palette from any image.
Automatically get the x and y coordinates for elements within a CSS sprite.
A beautiful visualization of the current times around the world.
Send someone here to help them figure out their browser and computer configuration.
Easily generate grids and guides in Photoshop.
Huge design inspiration gallery organized by tags.
Upload and share design mockups, and give them a nice backdrop.
Lightning-fast documentation for CSS, JS, PHP, etc.
Quickly get color shade variations for any color.
Get quick access to URLs for various common social network actions.
Find out more about the technologies behind a site.
Find out how much a link has been tweeted before sharing it.
Helps you generate regular expressions from a string.
Write and run SQL queries in your browser.
Tons of free tileable background patterns.
A beautiful bookmarklet to test your designs at multiple sizes.
Find out if a site is down for everyone, or just you.
Build a fancy ribbon with nothing but CSS.
This bookmarklet will tell you everything that’s wrong with your DOM.
Quickly compare multiple fallback font choices.
Create and preview CSS easing equations for animations.
A nifty gradient generator that uses a UI similar to Photoshop’s.
Draw things right there on a site, then share the result.
A Photoshop action that quickly ads a browser frame around any image.
Inspiring, space-related filler text instead of boring latin.
Find out instantly what font is being used on a page.
A responsive grid generator.
Create CSS3 styles using the Photoshop Layer Styles UI right in your browser.
Write and share CSS & HTML, view changes live, all using a beautiful UI.
DropMocks lets you upload images and create a gallery without even having to register.
This bookmarklet automagically strips the current page of its layout to make it easier to read.
Generate pixel patterns and export them as PNG or Base64 CSS code.
Generate a noise background PNG
This bookmarklet lets you preview any webfont on any page.
Prettify and clean up your CSS code.
Snippi is a minimalist snippet tool to share text and code.
Common patterns of markup and style for various elements such as tables, lists, etc.
Quick and easy boxes with pointers in pure CSS.
Pre-defined CSS styles to make your typography look beautiful.