The Luna Multiplayer repository describes a mod that adds multiplayer to Kerbal Space Program.
Open source
24 alternativesAlien
The ALIEN repository describes a CUDA-powered program for simulating artificial life.
About Alien
ALIEN (Artificial LIfe ENvironment) is an artificial life simulator built on a 2D particle engine for soft bodies and fluids. Every object consists of particles that can form elastic solids, fluids, or cells with functions such as sensors, muscles, and constructors. Cells are controlled by small neural networks and linked into creatures that move, feed, compete, and build offspring from genomes. With mutations enabled, populations can adapt and diverge without further intervention.
The engine runs entirely on the graphics card and handles millions of particles in real time, with a CUDA implementation and availability for AMD GPUs. Users can interact with a running world by drawing matter, moving creatures, or changing physics parameters, and use tools including a genome editor, evolution dashboard, and simulation browser.
Key features
- 2D particle engine for soft bodies, fluids, adhesion and fracture
- 15 cell types including sensors, muscles, attackers and communicators
- Cell-level neural networks forming creature nervous systems
- Genome-based reproduction with mutable networks and structure
- Genome editor with live preview and drawing tools
- Built-in browser for downloading and uploading shared simulations
Best for: Students, researchers, and hobbyists studying emergent ecosystems and evolution who have compatible GPU hardware.
Good for
- Engine runs on the graphics card and simulates millions of particles in real time
- Open-source repository with CUDA code and AMD GPU availability
- Browsing and downloading shared simulations needs no account
Watch out for
- Requires a graphics card because the simulation runs entirely on it
- Uploading simulations and genomes requires an account
Alien at a glance
- Website
- github.com/chrxh/alien
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Alien FAQ
Does ALIEN require a graphics card?
Yes. The engine runs entirely on the graphics card, written in CUDA and also available for AMD GPUs.
Do I need an account to get simulations from the server?
No account is needed for browsing and downloading; an account is needed to upload simulations and genomes.
How is selection handled?
There is no fitness function; selection arises from limited energy, predation, and competition for space, with mutations to networks, cell properties, and genome structure.
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