Varnish is an HTTP accelerator designed for content-heavy dynamic web sites. In contrast to other web accelerators, such as Squid, which began life as a client-side cache, or Apache and nginx, which are primarily origin servers, Varnish was designed as an HTTP accelerator. Varnish is focused exclusively on HTTP, unlike other pro...

nginx

Websites Using nginx

nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.

Web Hosting

Pantheon

Websites Using Pantheon

Pantheon hosts Drupal and Wordpress sites, while also delivering staging environments, backups, workflow, a global CDN and HTTPS.

Framework

PHP

Websites Using PHP

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

Ruby On Rails

Websites Using Ruby On Rails

Ruby on Rails is an open-source web framework that is optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.

Document Standard

X-UA-Compatible

Websites Using X-UA-Compatible

Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.

HTTPS

Websites Using HTTPS

Websites using https protocol.

HTML5 DocType

Websites Using HTML5 DocType

The DOCTYPE is a required preamble for HTML5 websites.

Open Graph Tags

OpenGraph Type Entity

Websites Using OpenGraph Type Entity

Open graph type entity tag

OpenGraph Url Entity

Websites Using OpenGraph Url Entity

Open graph url entity tag

Open Graph Protocol

Websites Using Open Graph Protocol

The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook

OpenGraph Site Name Entity

Websites Using OpenGraph Site Name Entity

Open graph site name entity tag

OpenGraph Description Entity

Websites Using OpenGraph Description Entity

Open graph description entity tag

Meta Tags

Meta Google Site Verification

Websites Using Meta Google Site Verification

Sites who has this tag are verfied by google to use WebMaster tools

Meta http-equiv

Websites Using Meta http-equiv

The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.

Canonical Tag

Websites Using Canonical Tag

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".

Meta Rel Home

Websites Using Meta Rel Home

By adding rel="home" to a hyperlink, a page indicates that the destination of that hyperlink is the homepage of the site in which the current page appears.

Favicon Tag

Websites Using Favicon Tag

Wesites using favicon rel tag

Meta Description

Websites Using Meta Description

Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.