Apache is a free and open-source cross-platform web server software.
Google Ads Conversion Tracking is a free tool that shows you what happens after a customer interacts with your ads.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.