Life & fun · alternatives · 2026

24 alternatives to ST World Engine

Player-created Virtual World

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. ST World Engine launched in 2022; newer entries below may have overtaken it.

1. 1
   Virtuali▲164

   Meet people, create an avatar & experience a virtual world

   2021 · its alternatives →

2. 2
   Mirage▲278

   Where you co-create the game as you play it

   2025 · its alternatives →

3. 3IB
   I built a multiplayer voxel browser game engine▲236

   2023 · kevzettler.com · its alternatives →

4. 4IM
   I'm open-sourcing my game engine▲318

   Modd.io is a collaborative game editor that runs in browser. It's kind of like Figma for game dev. We made this engine low-code and multiplayer-first, so developeres can quickly prototype casual multiplayer games. I hope some of you guys will find this useful. Would love to hear feedback also. Thank you. Engine Demo: https://www.modd.io

   2023 · github.com · its alternatives →

5. 5
   Supercraft▲136

   Build VR Sites with Your Hands

   2018 · its alternatives →

6. 6
   Stadia▲586

   A new gaming platform from Google

   2019 · its alternatives →

7. 7AT
   AI-town, run your own custom AI world SIM with JavaScript▲429

   Hi HN community! We want to share AI-town, a deployable starter kit for building and customizing your own version of AI simulation - a virtual town where AI characters live, chat and socialize. Inspired by great work from the Stanford Generative Agent paper (https://arxiv.org/abs/2304.03442). A few features: - Includes a convex.dev backed server-side game engine that handles global state - Multiplayer ready. Deployment ready - 100% Typescript - Easily customizable. You can fork it, change character memories, add new sprites/tiles and you have a custom AI simulation…

   2023 · github.com · its alternatives →

8. 8
   SIMA 2▲204

   Google's most capable AI agent for virtual 3D worlds

   Nov 2025 · deepmind.google · its alternatives →

9. 9
   Buenoverse▲297

   Build incredible 2D worlds with friends

   2023 · its alternatives →

10. 10
    HunyuanWorld 1.0▲145

    From a word or image to an explorable 3D scene

    2025 · 3d-models.hunyuan.tencent.com · its alternatives →

11. 11
    Anything World▲222

    Create 3D worlds with your voice

    2020 · its alternatives →

12. 12IB
    I built an indie, browser-based MMORPG▲340

    I've been working on an MMORPG that is now in alpha as a solo developer. Here are the major open source technologies that I use: Blender - 3D modeling software for creating the overall environment and every game object. I've gotten a lot of CC and Public Domain assets from https://poly.pizza GLTF - I export assets from blender to the GLTF asset format JSON - I write a JSON config for every game object that describes things like its name, its interactions, its collisions, etc. Node.js exporter - I iterate over the environment and every asset to create a scene hierarchy. I use…

    2024 · alpha.reconquer.online · its alternatives →

13. 13TA
    The Amalgam Engine – Easily create isometric virtual worlds▲73

    2022 · github.com · its alternatives →

14. 14
    Unreal Engine 5▲315

    Next-generation real-time rendering

    2022 · its alternatives →

15. 15
    Inworld AI▲181

    Brains for virtual characters, powered by AI

    2022 · its alternatives →

16. 16
    Virtuall.PRO▲156

    Bring your 3D projects to life, faster than ever

    2025 · virtuall.pro · its alternatives →

17. 17
    Exists▲132

    Generate your own 3D worlds and team-deathmatch in minutes

    2025 · exists.ai · its alternatives →

18. 18MM
    My multiplayer custom-engine game that loads in less than a second▲198

    2021 · vnav.io · its alternatives →

19. 19
    Veltos.ai▲185

    Create games & 3D models with just a prompt

    2025 · veltos.ai · its alternatives →

20. 20
    Waypoint-1.5▲110

    Real-time generative worlds on everyday GPUs

    Apr 2026 · over.world · its alternatives →

21. 21
    Worlds Beyond▲79

    A social creator platform & true sandbox style creator tools

    2023 · its alternatives →

22. 22
    Cryptovoxels▲73

    Voxel-based virtual world on the ethereum blockchain

    2018 · its alternatives →

23. 23
    Topia▲302

    Video chat in a virtual world

    2020 · its alternatives →

24. 24
    Croquet Microverse World Builder▲180

    Develop open metaverse worlds and publish to any web server

    2022 · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →