This course will become read-only in the near future. Tell us at community.p2pu.org if that is a problem.
Ren'Py is a cross-platform and free Visual Novel Engine written in Python. (wiki)
Ren'Py Forums: http://lemmasoft.renai.us/forums/
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Now, many of us who are new to Ren'Py have trouble learning it.
So let's cross this hurdle together, ^.^