Apache is a free and open-source cross-platform web server software.
Next.js is a React framework for developing single page Javascript applications.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
WhatsApp Business is a free to download app available on Android and iPhone using which businesses can connect with their customers.