Technologies in use by

Anti-bot CAPTCHA widget that helps digitize books by providing snippets of books for people to enter the text for. Owned by Google.

Wistia provides video hosting for businesses and personal users. The Wistia application includes detailed analytics (such as viewer heatmaps) and integrations with external stats tools like Google Analytics. The Wistia interface allows for complete customization of the video player, post and pre-roll behavior of the video, and a...

A rich hosted Exchange environment for every user without having to manage a server.

The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library.

Log Byte and Bandwidth Limiter modules.

The Apache HTTP Server is an open-source HTTP server for modern operating systems including UNIX, Microsoft Windows, Mac OS/X and Netware. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services observing the current HTTP standards. Apache has been the most popular web server ...

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

The DOCTYPE is a required preamble for HTML5 websites.

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.