Polycode is described as ''s core is written in C++ and currently runs on Mac, Windows and Linux with iOS and Android support planned in the future' and is a popular app in the Development category. There are more than 50 alternatives to Polycode for a variety of platforms, including Windows, Linux, Mac, Android and Online / Web-based. The best alternative is Unity. It's not free, so if you're looking for a free alternative, you could try Unreal Engine or GDevelop. Other great apps like Polycode are Wick Editor (Free, Open Source), LÖVE (Free, Open Source), CRYENGINE (Free Personal) and Adobe Animate (Paid).
Adventure Game Studio (AGS) - is the IDE and the engine meant for creating and running videogames of adventure (aka "quest") genre. It has potential, although limited, support for other genres as well.
Stride (formerly Xenko) is an open-source C# game engine designed for the future of gaming. It comes with a full toolchain and is especially well suited to create realistic games but allows you much more!.
Stencyl isn't your average game creation software; it's a gorgeous, intuitive toolset that accelerates your workflow and then gets out of the way. We take care of the essentials, so you can focus on what's important - making your game yours.
[Multimedia Fusion 2 has been replaced by Clickteam Fusion 2.5.] Game and software creation has never been easier or quicker than with Clickteam Fusion 2.5! With Fusion 2.5’s amazing event editor system you are able to quickly generate games or apps.
Cocos Creator is a complete package of game development tools and workflow, including a game engine (based on Cocos2d-x), resource management, scene editing, game preview, debug and publish one project to multiple platforms.
RPG Paper Maker is a free game maker engine including a 3D universe with many 2D sprites and some simplified 3D objects. Pretty close to the RPG Maker series, RPG Paper Maker finally give a way to create RPGs in a totally 3D universe as easy as it is in 2D!
One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes.