Marmalade is described as 'award winning, cross-platform development tool built around the belief that developers should be free to innovate, create and craft fantastic content for any audience on any device without compromising on performance or creative vision' and is an app in the Development category. There are more than 50 alternatives to Marmalade for a variety of platforms, including Windows, Linux, Mac, Android and Online / Web-based. The best alternative is Godot Engine, which is both free and Open Source. Other great apps like Marmalade are Unity (Free Personal), Unreal Engine (Free), GDevelop (Free, Open Source) and Wick Editor (Free, Open Source).
Godot is a fully featured, open source, MIT licensed game engine. It focuses on having great tools, and a visual oriented workflow that can export to PC, Mobile and Web platforms. It is a cross-platform 2D and 3D game engine and game development IDE.
Unreal Engine is a professional suite of tools and technologies used for building high-quality games across a range of platforms. Unreal Engine’s rendering architecture enables developers to achieve stunning visuals and also scale elegantly to lower-end systems.
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
The Wick Editor is a free and open-source tool for creating games, animations, and everything in-between. It's designed to be the most accessible tool for creating multimedia projects on the web. Your creations can run on any device with a web browser - that means mobile too.