The engine behind the most persistent world in gaming goes open source

On July 1, 2026, Fenris Creations — the Reykjavik studio formerly known as CCP Games — announced that Carbon, the engine behind EVE Online, has fully transitioned to open source.1

It is a quiet event compared to its weight. EVE Online is a sci-fi MMO that runs all of its players in a single shared universe, on one shared server, since May 2003. The code keeping that world alive hosted some of the largest battles in gaming history, including a Guinness World Record PvP fight with 8,825 simultaneous players.1 2

What is actually open

Carbon is not presented as a single engine but as a family of modules: Destiny for the world's physics simulation and pathfinding, Trinity for graphics, plus networking, audio, UI, resource management and scripting. The release covers over two dozen modules, published under the MIT license in the carbonengine GitHub organization.1 3 4 The Trinity repository, which notably handles ship and environment rendering, is directly browsable.5 So is Destiny, the simulation engine at the heart of the persistent world.6

Only two modules fall outside the permissive license, including spatial audio. The rest is inspectable, distributable, reusable.2 4

The most useful quote comes from Ben Hunter, senior development director for core technology: the stated goal is “to get the code out there for inspectability and building trust with the community”.2

Why this matters for builders

EVE's code has a legendary reputation in engineering. A single-shard persistent world, huge simultaneous battles, a player-driven economy that grew its own tools and market analysis. For decades, all of it was a black box — the very technology of the game, where nobody could look.

Opening the engine does not mean you can rebuild EVE: the game's value lives in the interaction between client, server, economy, community tools and living governance, far beyond the code alone.2

But the release offers something else: a written, dated trace of how a team built and maintained monumental technology, with its concrete architectural choices. For a developer, a student or a curious reader, it is a case study of twenty-three years of persistent-world engineering, suddenly inspectable.1 2

What comes next

Open-sourcing Carbon fits both EVE's history and the pitch around EVE Frontier, the in-development game that uses it. Fenris wants Frontier to be a community-open world, where players build systems, tools and experiences that persist inside it.1 2

The strategy is clearly the opposite of a black box: give access to the foundation, so the ecosystem adopts building blocks instead of depending on them in the dark.

What to remember

A fact: an exceptionally long-lived game engine, among the most complex in history, went open source under the MIT license, with a stated goal of inspection and trust.1 2

A nuance: opening the code is not opening the game. The durable value lies in reading a persistent-world architecture, not in some possible clone of EVE.

And a question: if the server of gaming's most genuinely “persistent” world becomes inspectable, how long will other vast online worlds stay black boxes?