FUSE for macOS allows you to extend macOS's native file handling capabilities via third-party file systems. It is a successor to MacFUSE, which has been used as a software building block by dozens of products, but is no longer being maintained.

Features
As a user, installing the FUSE for macOS software package will let you use any third-party FUSE file system. Legacy MacFUSE file systems are supported through the optional MacFUSE compatibility layer.

As a developer, you can use the FUSE SDK to write numerous types of new file systems as regular user space programs. The content of these file systems can come from anywhere: from the local disk, from across the network, from memory, or any other combination of sources. Writing a file system using FUSE is orders of magnitude easier and quicker than the traditional approach of writing in-kernel file systems. Since FUSE file systems are regular applications (as opposed to kernel extensions), you have just as much flexibility and choice in programming tools, debuggers, and libraries as you have if you were developing standard macOS applications.

How It Works
In more technical terms, FUSE implements a mechanism that makes it possible to implement a fully functional file system in a user-space program on macOS. It provides multiple APIs, one of which is a superset of the FUSE API (file system in user space) that originated on Linux. Therefore, many existing FUSE file systems become readily usable on macOS.

The FUSE for macOS software consists of a kernel extension and various user space libraries and tools. It comes with C-based and Objective-C-based SDKs. If you prefer another language (say, Python or Java), you should be able to create file systems in those languages after you install the relevant language bindings yourself.

The filesystems repository contains source code for several exciting and useful file systems for you to browse, compile, and build upon, such as sshfs, procfs, AccessibilityFS, GrabFS, LoopbackFS, SpotlightFS, and YouTubeFS.

What's New:

Version 5.1.3:

General:

• Update build process to use Xcode 26.2 (macOS 26.2 SDK)

Kernel Extension (Kernel Backend):

• Update kernel extension to version 5.1.3
• Add special handling for the O_EXEC open flag to prevent a kernel panic. Internally, O_EXEC is treated as O_RDONLY, meaning a readable file descriptor will be requested from the file system server. For details, see #1130.

FSModule (FSKit Backend):

• Introduce foundational changes in preparation for new features in macFUSE 5.2

libfuse3:

• Fix an issue that resulted in the extended attribute name passed to the setxattr handler always being an empty string. On macOS,
• FUSE_COMPAT_SETXATTR_IN_SIZE needs to account for the additional position field and its associated padding. For details, see #1134.

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