Website aptes.org

A freely available eCommerce plugin that enables shop facilities on your WordPress website.

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

Website using the € symbol on their website - meaning it may accept payment in Euros.

Russian payment provider

Google Tag Manager makes it easy for marketers to add and update website tags including analytics, remarketing, and more.

DNS services provided by OVH.

A family of standard web feed formats used to publish frequently updated information like blog entries, news headlines, audio and video.

Open graph locale entity tag

Open graph type entity tag

Open graph url entity tag

Open graph description entity tag

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

Open graph image entity tag

Open graph site name entity tag

A web page. Every web page is implicitly assumed to be declared to be of type WebPage, so the various properties about that webpage, such as breadcrumb may be used. We recommend explicit declaration if these properties are specified, but if they are found outside of an itemscope, they will be assumed to be about the page

A scheme.org entity that represents the most generic kind of creative work, including books, movies, photographs, software programs, etc.

A scheme.org entity that represents a blog.

This page contains a meta robots tag which tells search engines and robots to index or not index the page.

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

Sites using Html 5 SVG Tag

UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.