&what: Discover Unicode & HTML Character Entities : amp-what is a quick, interactive reference of 14,500 HTML character entities* and common Unicode characters, 8859-1 characters, quotation marks, punct...
Email Standards Project : The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility ...
AlsacréationS : Alsacréations est une communauté dédiée à l'apprentissage des standards web (W3C, HTML, XHTML, CSS) ainsi qu'à l'accessibilité numérique
The Big List of Naughty Strings : The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.
This site provides a collection of schemas that webmasters can use to markup HTML pages in ways recognized by major search providers, and that can also be used for structured data interoperability (e.g. in JSON).
SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.
phpDocumentor : phpDocumentor enables you to generate documentation from your PHP source code. This documentation provides an in-depth view of your project to you, yo...
When can I use... : Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.