Apache is a free and open-source cross-platform web server software.
Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google account.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.