If you're using a hosted instance (as in, you're not using a Cloud instance) you can turn on the Global Activity page, which provides some statistics.
However, other than that there isn't much available. Lots of people want this, hence all of the plugins that do it are paid-for and not free. I'm not sure if you can pull real-time information on user activity from the database; hopefully someone else here will be able to tell you.
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