Anti-bot CAPTCHA widget that helps digitize books by providing snippets of books for people to enter the text for. Owned by Google.
Google APIs are application programming interfaces developed by Google which allow communication with Google Services and their integration to other services.
iDEAL is a payment method made up of a collection of agreements and standards for an immediate online transfer from a purchaser’s bank account to the bank account of a webshop or organisation.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
Google's hosted library for web fonts. Allows websites to choose and use fonts from a free, wide variety of fonts.
This page contains a meta robots tag which tells search engines and robots to index or not index the page.