Apache is a free and open-source cross-platform web server software.
Google Analytics is a free web analytics service that tracks and reports website traffic.
PHP is a general-purpose scripting language used for web development.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
Sirdata is a self-service, third party data-collecting platform that specialises in the collection of behavioural data, predictive targeting and selling of audience segments.