From Ren'Py

Ren'Py 5.1.0 "Paper Anniversary"

Ren'Py 5.1.0 "Paper Anniversary" was released on August 24, 2005. It comes with a demo game intended to show off some of the features of the engine. This demo game was last updated in version 5.0.

• Download the release, including source and Windows binaries. (3.0 MB)
• View the Ren'Py reference manual.
• View the script of the demo. (colored)
• View the changelog.
• View information about releasing Ren'Py games.
• Download Ren'Py Launcher for Macintosh (needed to run on Mac OS X).
• Download renpy module installer for windows (rarely needed).