ClickTeam Fusion is described as '[Multimedia Fusion 2 has been replaced by Clickteam Fusion 2.5.]' and is a game development tool in the development category. There are more than 50 alternatives to ClickTeam Fusion for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best ClickTeam Fusion alternative is Godot Engine, which is both free and Open Source. Other great apps like ClickTeam Fusion are GDevelop, Scratch, Redot Engine and Construct 2.
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.
Flax Engine is claimed the most agile game engine. It's open source, cross-platform and it lets you write scripts in C++ and C# seamlessly. Also focused on lightweight development. A true game changer.
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.
ezEngine is a free, open source game engine written in C++. Its philosophy is to be modular and flexible, such that it can be adapted to many different use cases. EZ utilizes a plugin system to integrate features such as FMOD or Jolt Physics.
ENIGMA, the Extensible Non-Interpreted Game Maker Augmentation, is an open source cross-platform game development environment derived from that of the popular software GameMaker Legacy.
Panda3D is a game engine, a framework for 3D rendering and game development for Python and C++ programs. Panda3D is Open Source and free for any purpose, including commercial ventures, thanks to its liberal license. Go ahead and grab it here.
Phaser Editor is a tool for HTML5 games creation. It provides several built-in editors for texture packing, JavaScript coding, Assets management, and 2D level building.
A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.
Pixel Game Maker MV allows you to build up your own action game with no programming knowledge necessary. This engine was designed with the idea of giving a voice to people's passions, allowing them to freely express the game that they have held in their hearts.
Banquise is a global community of players and creators. Create any games or other interactive content in no-code and share it with the whole community.
GemRB (Game Engine Made with preRendered Background) is a portable open-source reimplementation of the Infinity Engine that underpinned Baldur's Gate, Icewind Dale and Planescape: Torment. It sports a cleaner design, greater extensibility and several innovations.
RPG in a Box is designed to be a set of tools for easily creating 3D grid-based, voxel-style role-playing and adventure games—everything you will need for building and sharing your own game, all packaged together in a box, so to speak!
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