Edit and visualize JSON.
WhatsMyBrowserSize
Find out what your browser size is.
X-icon Editor
A handy icon editor, perfect for retina favicons.
Zbugs
Compress and gzip your CSS and JS.
Modular Grid
Another option for generating grids.
CSSComb
Reorder your CSS properties as you please.
JS2Coffee
Converts your JavaScript to CoffeeScript.
Brand Colors
Quick access to major online brand colors.
Noise Generator
Get your noise! Supplies limited! Fresh noise here!
147Colors
Apparently, CSS has a color named “YellowGreen”. As well as 146 others.
RequestB.in
Get a unique URL that shows every request made to it.
Ipsum.me
An advanced placeholder text generator that fills in names and cities.
UICloud
Search and download across many free UI resources sites.
Moqups
Create and edit wireframes online.
Browserling
Interactive cross-browser testing.
Mergely
Merge and diff files online.
Jquer.in
Like The Toolbox, but for jQuery plugins.
CSS3 Click Chart
A handy CSS3 reference with live examples.
IconsGuide
A guide to premium icon sets with a comparison table.
WebPageTest
Test your website’s performance and get a nice graph.
Color Ramp Creator
Create color ramps for pixel art.
TinyPNG
Advanced lossy compression for PNG images
CDNJS
A content delivery network for many Javascript libraries.
.htaccess Redirect
Generate redirect codes for your .htaccess files.
IconMonstr
Search and download free symbols and icons.
GradientFinder
Extract a CSS gradient from any image.
ReFiddle
Create and test regular expressions.
Dirty Markup
Clean up your HTML, CSS, or JavaScript.
Hurl
Make HTTP requests with custom parameters and headers.
QRHacker
Generate and customize QR Codes.
Codepen
A powerful online editor supporting HAML, SASS, Coffeescript, and more.
RubyFiddle
Write and run Ruby code in your browser.
CSS3 Generator
Another useful CSS3 generator.
The Responsinator
Another good option to test your design at multiple sizes.
Cropp.me
Auto-crop images in multiple sizes.
@FontFace Generator
Generate an @font-face-compatible font from a font file.
Piknik
Ultra-minimalist color picker.
GTMetrix
Another tool that will explain why your site is painfully slow.
XML Playground
Write and test XML and XSLT online.
Kuler
By popular demand: Adobe’s well-known color picking tool.
Degreees
Get the weather with a sweeet UI.
CSSPainter
This tool lets you combine multiple effects to create complex pure CSS objects.
Testico
Preview your app icon in various settings.
Browser Cover
Quickly add various browser chrome frames to any image
Pixabay
A search engine for public domaine images.
Type Calculator
Helps you set your type for optimum readability.
JS Beautifier
Make your Javascript code look good.
JS Bin
An easy way to write and run Javascript in your browser.
CSS Deck
A collection of free CSS snippets from around the web.
Easings
This site will put you at ease. Get it? At ease?
The Pixelator
Pixelate images and combine multiple effects.
CSS3Please
Helps you generate common CSS3 rules.
Numerics
A simple scientific calculator.
Time.is
Find out what the time is, here and elsewhere.
MF Animated Gif
This creatively named site lets you build animated gifs from separate images.
UI Snippets
A collection of free, coded HTML5/CSS user interface snippets.
OneQstn
Quickly set up one-question surveys.
Freepik
A search engine for free vectors and photos.
Pingdom
Test how long a page takes to load.
ColorSchemeDesigner
Generate various color schemes from a single color.
Bear CSS
Generate a blank stylesheet skeletons from an HTML file.
ColorHexa
Convert a color to HSL, RGB, etc. and get more info about it.
CSS Warp
Get the HTML/CSS code for text written along a custom path.
Initializr
Generate HTML5 starting templates for your new projects.
Snipt
A repository of public and private code snippets.
Fontello
Pick among various pictograms sets to create your own icon font.
Wordmark
Display a word in every font you have on your system.
Screenqueri.es
View a site in multiple sizes, even including a mobile UI overlay.
Gridulator
Specify the total width and number of columns, and get different options for column width and gutters.
Minute Bill
Create invoices instantly, without even needing to sign up.
Icon Finder
Search through more than 150,000 free icons.
Worldtime Buddy
A nifty tool to keep track of the time in different places.
When Can I Use
Handy charts showing which features are compatible with which browser.
RegExr
This regular expression tool includes a reference and pre-made snippets.
Nice Entity
A nice HTML entities (special characters) reference
Regexpal
Another nice tool to help you write regular expressions.
CSS3 Generator
Oldie but goodie: the CSS3 generator lets you (what else) generate CSS3.
Patternizer
Create stripe patterns with multiple layers.
LoremPixel
Get placeholder images in any size, for any occasion.
JPEGMini
Compress your JPEG images without losing (too much) quality.
PunyPNG
Image compression tool that works with JPEGs, GIFs, and PNGs.
AndroidUX
A collection of UX/UI examples from various Android apps.
SpritePad
Generate sprite sheets by drag-and-dropping images.
IcoMoon
Select icons (or your own vector files) and generate a pictogram font from them.
Pttrns
A collection of mobile app screenshots, organized by interaction patterns.
ScriptSRC
Get embed URLs for the most common Javascript libraries.
Rubular
Write and test Regular Expressions, also includes a handy reference.
Mobile UI Patterns
A gallery of mobile user interfaces organized by interaction patterns.
HTML5 Please
Look up advanced HTML5 and CSS3 features and find out which browsers support them (hint: not IE).
AjaxLoad.info
A great source for animated spinners and various loading gifs.
Colllor
Get color variations from a single color.
CSSEaser
Advanced CSS easing animation tool.
The Noun Project
Free pictograms for many, many things.
CSS Selectors
Brush up on your CSS selectors with live examples.
ShapeCatcher
Find a unicode character simply by drawing its shape.
Placehold.it
Generate placeholder images just with an URL.
STRFTime
Helps you build a date & time string with the appropriate symbols.
Pictaculous
Generate a color palette from any image.
SpriteCow
Automatically get the x and y coordinates for elements within a CSS sprite.
Every Time Zone
A beautiful visualization of the current times around the world.
Support Details
Send someone here to help them figure out their browser and computer configuration.
GuideGuide
Easily generate grids and guides in Photoshop.
Pattern Tap
Huge design inspiration gallery organized by tags.
Mocku.ps
Upload and share design mockups, and give them a nice backdrop.
DocHub
Lightning-fast documentation for CSS, JS, PHP, etc.
0 to 255
Quickly get color shade variations for any color.
Bliss Control
Get quick access to URLs for various common social network actions.
BuiltWith
Find out more about the technologies behind a site.
Is It Old?
Find out how much a link has been tweeted before sharing it.
RegExp Generator
Helps you generate regular expressions from a string.
SQLFiddle
Write and run SQL queries in your browser.
Subtle Patterns
Tons of free tileable background patterns.
Responsive Test
A beautiful bookmarklet to test your designs at multiple sizes.
Down For Everyone
Find out if a site is down for everyone, or just you.
Favicon Generator
Lets you create and download a favicon, and even animate it.
Ribbon Builder
Build a fancy ribbon with nothing but CSS.
Dom Monster
This bookmarklet will tell you everything that’s wrong with your DOM.
FFFFallback
Quickly compare multiple fallback font choices.
Cubic-Bezier
Create and preview CSS easing equations for animations.
Gradient Generator
A nifty gradient generator that uses a UI similar to Photoshop’s.
Markup.io
Draw things right there on a site, then share the result.
BrowserUI
A Photoshop action that quickly ads a browser frame around any image.
SpaceIpsum
Inspiring, space-related filler text instead of boring latin.
WhatFont
Find out instantly what font is being used on a page.
Gridpak
A responsive grid generator.
Layer Styles
Create CSS3 styles using the Photoshop Layer Styles UI right in your browser.
JSHint
Detect errors and potential problems in JavaScript code.
Dabblet
Write and share CSS & HTML, view changes live, all using a beautiful UI.
DropMocks
DropMocks lets you upload images and create a gallery without even having to register.
Readability
This bookmarklet automagically strips the current page of its layout to make it easier to read.
JSFiddle
Run and share Javascript, HTML and CSS code.
Patternify
Generate pixel patterns and export them as PNG or Base64 CSS code.
NoisePNG
Generate a noise background PNG
FontFriend
This bookmarklet lets you preview any webfont on any page.
Procssor
Prettify and clean up your CSS code.
Copy Paste Character
A nice tool to browse and copy various Unicode characters.
Snippi
Snippi is a minimalist snippet tool to share text and code.
Pea.rs
Common patterns of markup and style for various elements such as tables, lists, etc.
CSS Arrow Please
Quick and easy boxes with pointers in pure CSS.
Type-a-file
Pre-defined CSS styles to make your typography look beautiful.
