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Online Tools

WebPagetest
Google PageSpeed
PyRegex Your Python Regular Expression's Best Buddy
Debuggex Online visual regex tester. JavaScript, Python, and PCRE.
Color Scheme Designer
explainshell write down a command-line to see the help text that matches each argument
Check IMEI iPhone check whether an iPhone is locked.
Terminal Color Scheme Designer
ColorPicker
Gists share code.
Pastie share code.
http://codepaste.net/ share .NET code.