Stackoverflow-like Q&A forum for my site

I am teaching a course and would like to let my students ask and answer questions related to the course material. I am looking for an Q&A forum similar to, namely:

  • Everyone can ask questions and write answers;
  • There is a reputation system - users gain reputation by asking good questions and getting good answers.

Is there an application with these features, that I can easily install on my Ubuntu droplet?

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