Girellu: a personally curated content pack for Assetto Corsa

Content for a car simulator, curated by one person

Girellu is personally curated content for Assetto Corsa. The repository description puts it more bluntly, as a project whose aim is to make Assetto Corsa suck less.

That is a good description of the whole shape of the thing. There is no application here, no installer, no configuration tool. There is a repository of content files, a wiki, and a Discord, and the primary language the repository reports is Lua, which is the scripting language Assetto Corsa uses for its content and physics modifications.

The audience is therefore the Assetto Corsa player who has installed the game, worked through the basics, and now wants the visual and physics extras. The README points new players at an AC startup guide in the project wiki, which suggests the wiki rather than the repository is where the instruction lives.

The homepage is the wiki itself, at the Girellu wiki on GitHub, and that is an unusual choice worth noting. A project whose documentation is a wiki rather than a README is signalling that the documentation changes independently of the code, or that the author thinks in wiki pages rather than repository files.

The licence is another unusual signal. GitHub reports it as Other, a custom licence it cannot classify, and the LICENSE.md file at the root holds the terms. For a project that distributes third party filters and mods assembled from other people's work, a hand written licence is not surprising, and it is the first file to read before installing anything.

The last push to the repository was on 2026-06-12, and the project is not archived.

Releases, Filters and Mods, and the arch cars

The FAQ in the README answers the question a new user asks first, which is what the folders mean, and the answer is a tree.

Girellu/ - # You are here
└── Releases/ - # Released Girellu content
    ├── Filters - # AC Post-processing Filters
    └── Mods - # General AC content/
        └── Arch Cars Public (Arch Modified Physics)

The structure is small and tells you what the project actually contains. Everything lives under Releases, and inside it there are two branches. Filters holds the Assetto Corsa post-processing filters, which are the effects that change how the rendered image looks, from the colour grading to the motion blur handling. Mods holds general Assetto Corsa content, and inside that the Arch Cars Public folder holds arch cars with modified physics.

The arch cars are the item with the clearest identity. A car with modified physics is not a different model, it is the same car with its handling characteristics adjusted, and a folder of them published under a name that includes the word Public suggests the author is sharing a set that he uses and considers useful rather than keeping private.

Two things are worth noticing about the arrangement. The Filters and Mods split matches the two kinds of thing the Assetto Corsa community makes: visual post-processing, which is configured per car or per track, and content and physics, which is what the game loads from its content directories. And the tree carries no build scripts, no package manifest and no test suite, which confirms that this is a file distribution rather than a piece of software.

The repository's own top level is equally small: .gitattributes, LICENSE.md, README.md and the Releases directory. There is no source tree to read, only content to install.

Downloading with GitHub Desktop, and how updates work

The download instructions are short, and they assume a specific tool.

First, log in or create a GitHub account. Second, install GitHub Desktop and log in with that account. Third, clone the Girellu repository by following GitHub's own tutorial on cloning a repository with GitHub Desktop. The README pairs this with a link to download the repository as a zip archive:

https://github.com/archibaldmilton/Girellu/archive/refs/heads/master.zip

So there are two routes. The zip is the one for somebody who wants the files once, and the clone is the one the README recommends, because the next step depends on it.

Updates are described as updating the repository content, and the README illustrates that with a clickable button image pointing at GitHub Desktop's fetch and pull actions. That is the whole update story: a GitHub Desktop client holds the repository, and pulling brings in new content.

The reason for insisting on a clone rather than a download is worth spelling out, because it explains how the content gets into the game. Assetto Corsa loads its content from directories on disk, so the files have to be copied out of the repository into the game's content folders. Keeping the repository as a working copy means the files stay in one place and can be re-copied after an update, rather than being scattered across the game's directory structure by hand.

That arrangement also has a cost. The person doing it has to know where the game's content directory is, which changes between installations, and the README does not describe it in the visible text. The wiki is where that instruction lives, along with the startup guide for new players.

Hosting on GitHub to avoid community feuds

The README has a question that answers itself: why host on GitHub? The two answers are given as a pair.

The first is to avoid community feuds, and the parenthesis names the places: Discord servers, RaceDepartment, and so on. The second is that it is quicker and easier to host.

The first answer is the revealing one. Assetto Corsa modding has a scene with servers, forums and personalities, and the author has decided that a neutral host is a better place for the files than a community space where arguments happen. Hosting the content on GitHub means the download is a repository clone and the conversation happens on a Discord, but the artefacts themselves are not attached to any one of those spaces.

There is a practical dimension to the same decision. GitHub gives version history for free, so the content is recoverable if it is broken, and updates are distributed by a pull rather than by a post asking people to download an attachment again. The releases are named by month, which fits that model exactly.

The related communities section points at the neighbours in this space. The Custom Shaders Patch and Sol WeatherFX projects each have a Discord and a Patreon, and Girellu has its own Discord for development and support, with no Patreon listed for it. Notably, no Patreon is listed for Girellu itself, while the neighbouring projects both have one.

The README also asks readers to star the repository to show appreciation, which is the whole of the funding model for a project whose purpose is to make a game less annoying.

Release tags that name the version they support

The releases are where the age of the project shows, and they are labelled in a way that says something useful.

There are two named releases. A3PP_February_2022, titled A3PP: Support for Pure 0.68+, is dated 2022-01-31. And A3PP_June_2022, titled Support for Pure 0.102+, is dated 2022-05-31. The names are month based, and each one states which version of Assetto Corsa content it supports, naming the Pure version the content was built against, Pure being a community graphics mod in the same scene as the Custom Shaders Patch and Sol WeatherFX projects the README links to.

So the two tags differ only by which Pure version they target, and both are from the first half of 2022. Against that, the last push to the repository was on 2026-06-12, more than four years later. That gap is the honest shape of the project: the content directory is still being touched, but the named release tags stopped after the June 2022 build.

That tells you what kind of thing Girellu is. It is a living folder of content whose compatibility markers were last stated in 2022, and it is maintained by someone who updates files rather than who ships packaged versions. The repository is not archived, so it is not frozen either.

For anyone installing, the practical consequence is that the Pure version markers on the release names are the closest thing to a compatibility statement the project offers, and they are four years old. The wiki is where you would look for whether the current content still works with the current game build, and the Discord is where that question gets answered in practice.

Where Girellu fits, and what to check first

There is a limit to this project that is easy to state: it is a file distribution, and you are responsible for the files.

There is no installer and no automatic update path beyond a pull in a Git client. The content has to be placed in the game's content directories, and the README's visible text does not describe where those are or how the layout is expected to look once installed, so that knowledge lives in the wiki. If a mod breaks the game, nothing in the repository rolls it back, and the version history in Git is your only undo.

The licence is the other thing to settle before installing. GitHub classifies it as a custom licence, which means it is not one of the standard ones and the terms are the author's. Filters and mods are frequently the work of other people, and a curated repository of them raises the question of what the author can grant and what the original authors licensed. That is a question for the LICENSE.md file, not for this article.

The alternative approach is to assemble the same collection yourself from the individual community projects, each of which has its own Discord, its own release page and its own terms, with the Custom Shaders Patch and Sol WeatherFX among them. The difference in approach is that those projects give you the source of each piece with its own attribution, whereas Girellu gives you one curated set, with a single point of contact for problems. The trade is convenience and compatibility against transparency about provenance, and which side of it you fall on depends on how much you care about where each file came from.

The sensible way to start is the wiki. Read the AC startup guide the README points new players at, check the Pure version the content targets against the game build you have, and read LICENSE.md before copying anything into the game's folders.

Editorial conclusion

Girellu suits an Assetto Corsa player who wants one place to find post-processing filters and a known set of mods, and who is comfortable installing files into the game's content directories and reading a wiki before starting. It does not suit anybody who needs a supported, versioned installer, because the project is a repository of content with a custom licence and a wiki, and the newest named releases date from 2022 even though the repository itself was pushed to on 2026-06-12. Check three things before you install: the AC startup guide in the wiki, which the README points new players at, which Pure version of Assetto Corsa the content targets, since the release tags name versions such as Pure 0.102+, and the LICENSE.md file, because GitHub cannot classify it and the terms are the author's own rather than a standard open source licence. The project has a Discord for development and support.

Frequently asked questions

Official sources

1. archibaldmilton/Girellu on GitHub
2. Issues
3. Project website
4. README
5. Releases