The Ren'Py Visual Novel Engine
Aaaah, you mean something like a visual novel such as DDLC? If so, there's this engine made for those kind of games called Ren'Py I've heard of not long ago (official website/www.renpy.org/)
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
Folia is a minimalistic authoring tool for narrative games
1 project | news.ycombinator.com | 3 Jun 2022
Cant get sound effects to fade out
1 project | reddit.com/r/RenPy | 1 Jun 2022
A fan project for a DS sequel
1 project | reddit.com/r/Choices | 30 May 2022
Error: script error: (see console for details)
1 project | reddit.com/r/RenPy | 29 May 2022
Is Renpy 7.5 and Renpy 8, the same thing?
1 project | reddit.com/r/RenPy | 18 May 2022