reCAPTCHA is a free service that helps to digitize books, newspapers and old time radio shows while preventing automatic form filling by robots.
|Distinctive features||The service helps to digitize books or audio shows|
|Multi-language||Yes English, German, French, Dutch... (8 languages + custom)|
|Visual customization||Yes 4 themes + custom|
|Code sample||PHP, ASP, Java/JSP, Perl...|
|Notable web site using it|