List of freely available online web-developer tools [closed]

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What free, online tools does a web developer has at his disposal and "should know about"?

To set the spirit of the list, here are some examples:

• Google Code playground
• jsFiddle
• Snipt
• CSS Validation Service
• Pastie
• CodePad
• Ideone
• JS Bin
• JSLint
• CSSDESK
• Visual jQuery

I think a good list could come in very handy for many!

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Whilst you probably want to automate this on your server, I still find jscompress.com handy to minify or pack scripts.

Some others...

• CSS Sprite Generator
• CSS Border Radius
• CSS Gradient Generator

(there are tonnes).

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Yahoo has a number of good tools. The YUI material alone is fantastic.

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I've found Chrome's Developer Tools (Ctrl+Shift+I) to be absolutely indispensable when debugging HTML, CSS, and JavaScript.

Fiddler is a fantastic tool to spy on (and fiddle with) the traffic your browsers (and other HTTP-connecting applications) are sending.

Aptana is great as a HTML/CSS/JavaScript IDE, complete with red sqigglies for syntax errors and intellisense/autocomplete. (You'll never use Notepad again.)

jQAPI is a really zippy version of the jQuery documentation.

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I find yUML an invaluable tool to create diagrams online!

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For PHP development I always use the FREE phpDesigner 2007 (Personal). It can debug PHP with single step trace and breakpoints. It's also a good editor for CSS, HTML, Javascript, XML etc...

(look under "older downloads" at the bottom).

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Bubble supports create mind-mapping diagram online. I use it to organize general idea about the application.