Apache is a free and open-source cross-platform web server software.
Drupal is a free and open-source web content management framework.
Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
JivoChat is a live chat solution for websites offering customizable web and mobile chat widgets.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.