Apps similar to Castle Game Engine include Godot Engine, which is free and open source. Other options are Unity, Unreal Engine, GDevelop and Candlestick. There's no shortage of Game Development Tools like Castle Game Engine, with more than 50 alternatives for Windows, Linux, Mac, Android and the web.
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.
Poland
EU
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.
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Write JavaScript 2D and 3D games, compile to native. Create, play, and publish from your terminal.
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A free software game engine focusing on developing games faster, more modular and stable with true -1 day portability support.
Switzerland![Drag[en]gine screenshot 1](https://img.alternativeto.net/s/309x197/jpeg/drag-en-gine_786666_full.webp)
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LunarEngine (formerly Librebox) is an open-source game engine powered by Luau. It delivers a sandbox-style API and development model inspired by popular sandbox engines, so existing Luau code runs with minimal changes.
JMonkeyEngine3 it’s a free, open source game engine, made especially for Java game developers who want to create 3D games using modern technology. The software is programmed entirely in Java, intended for wide accessibility and quick deployment.
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.
A game engine written in Python, extending support across multiple GPU devices with 3D rendering, PBR Renderer and much more.
The G3D Innovation Engine is a commercial-grade C++ 3D engine available as Open Source (BSD License). It is used in commercial games, research papers, military simulators, and university courses. G3D supports hardware accelerated real-time rendering, off-line rendering like ray...
United States
batari Basic (bB) is a BASIC-like language for creating Atari 2600 games. It creates a binary file that can be run on an Atari 2600 emulator or the binary file may be used to make a cartridge that will operate on a real Atari 2600.
NeoAxis 3D Engine is positioned as a universal development framework for 3D projects. The framework can be applied when developing various types of 3D projects, such as the creation of video games, development of simulators, virtual reality and visualization software, creation...
United Kingdom
The Graphics Development Engine for Business and Industry. Build high-quality 3D solutions and deploy to any platform.
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