Software for companies

What type of software could companies use that is open source for their needs?
I was in a KFC and saw the order screen had Ubuntu in the background. Made me wonder what else people could use.

I work in a company where we use Open Office / Ubuntu for our systems

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wow,… that’s a difficult question to answer. it’s kind of like, “I grown my own food, what meal should I prepare?”
I guess it depends on the type of business and what that business provides.