Is Unturned open source now?

Source-available, precisely: the full source and project files are public as the U3-SDK on GitHub under SDG's custom non-commercial license. It is not OSI open source - SDG has stated it would like to re-license under MIT in the future if it can re-acquire certain rights.

Does the source release change anything for Unturned servers?

Nothing breaks: official servers, the Workshop, and plugin frameworks keep working, and SDG continues developing the game with the public source kept in sync. Expect deeper community mods over time, and vet source-built mods carefully before running them on a live server.

Can I build a commercial product on the Unturned source code?

The current license permits non-commercial projects. Anything commercial requires reading the license terms carefully - the possible future MIT re-licensing is an ambition SDG has voiced, not a commitment.

preservation

Unturned Just Went Source-Available: What the U3-SDK Means for Servers and Preservation

A twelve-year-old free-to-play survival game with a huge modding scene just did the thing the preservation movement keeps asking for: released its complete source and project files - while still actively developing the game. Here's what the U3-SDK actually is, what the license does and doesn't allow, and what changes for the people running servers.

Published 2026-07-18 · Updated 2026-07-18

What was released on July 7

Smartly Dressed Games published the U3-SDK on GitHub: Unturned's full source code and project files. This is not a decompiled dump or a modding API - you can browse the game's actual code and run Unturned inside the Unity editor, targeting the same PC platforms as the Steam build: Windows, macOS, and Linux including Steam Deck. Patch 3.26.3.4 shipped the same day, and SDG has been explicit that the public source will be kept in sync with official releases. This is an expansion of the game's surface, not a handoff or a farewell.

The license, read carefully

The code ships under SDG's custom license permitting non-commercial projects built on it. Two things follow:

Total conversions, deep mods, experiments: yes. The sky's-the-limit framing is the studio's own, and the Unity-editor workflow makes previously reverse-engineering-grade projects straightforward.
Paid plugins, hosted commercial services on the code: read the license first. Non-commercial is the current boundary. SDG has said it would like to re-license under MIT later, if it can re-acquire certain rights after finishing another game - an ambition, not a promise, and we'd treat any business plan built on that future as speculative.

What changes for server owners

Today: nothing breaks. Official servers, the Workshop, RocketMod/OpenMod plugin stacks - all keep working exactly as before, and the studio keeps shipping updates. What changes is the trajectory:

Expect a wave of deeper mods over the coming months - the kind that needed engine access. Vet source-built mods with the same care as Workshop items before they touch a live server; source access cuts both ways.
The bus-factor question is answered. If official updates ever stopped, the community demonstrably has everything needed to continue - which is precisely what most live games cannot say.

The preservation angle

We've spent the year covering the other direction: live-service shutdowns, racing-game server graveyards, and the Stop Killing Games push to make playability outlive publishers. Unturned just demonstrated the strongest possible counter-model: source availability while the game is alive, not as a eulogy. No emulator archaeology, no legal gray zone, no waiting for a shutdown announcement to start preserving. A studio released the code, kept developing, and made its game effectively un-killable in the same move. Every publisher that claims dedicated-server releases are impractical now has a twelve-year-old free-to-play counterexample with one of the largest modding scenes on Steam. The announcement is on SDG's blog.