Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Drupal is a free and open-source web content management framework.
Font Awesome is a font and icon toolkit based on CSS and Less.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.