Apache is a free and open-source cross-platform web server software.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HubSpot is a marketing and sales software that helps companies attract visitors, convert leads, and close customers.
Mailcheck is a JavaScript library designed to address the issue of misspelled email addresses during user input.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.