How do I fill a scene with a very large, realistic-looking forest?

How do I fill my scene with a realistic-looking large forest with about 1,000 or more trees without crashing blender with hundreds of millions or even billions of tris?

Back from 2019…

or even from 2012:

Alright, so how do I fill my scene with thousands of trees?

Is there an addon for this?

Use @Strike_Digital ’s Alpha Trees add-on

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Is it free?