What are some alternatives?
When comparing RenPy and GDevelop, you can also consider the following products
Unity - The multiplatform game creation tools for everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Stencyl - Make iOS (iPhone/iPad), Android, Flash, Windows & Mac games without code using Stencyl.
BYOND - BYOND is the premier community for making and playing online multiplayer games.
Construct 2 - Scirra Construct is a 2D game development engine with a focus on building games visually.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.