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vfsStream is a stream wrapper for a virtual file system that may be helpful in unit tests to mock the real file system. It can be used with any unit test framework, like PHPUnit or SimpleTest.
A Bloat Aware Filesystem for Container Debloating.
BLAFS is a bloat-aware filesystem for container debloating. The design principles of BLAFS are effective, efficient, and easy to use. It detects the files used by the container, and then debloats the container by removing the unused files. The debloated containers are still functional and can run the same workload as the original containers, but with a much smaller size and faster deployment.
WinCse is an application that integrates AWS S3 buckets with Windows Explorer, allowing you to treat S3 buckets as if they were part of your local file system.
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WinFsp is system software that provides runtime and development support for custom file systems on Windows computers. In this sense it is similar to FUSE (Filesystem in Userspace), which provides the same functionality on UNIX-like computers.
Typically any information or storage may be organized and presented as a file system via WinFsp, with the benefit being that the information can be accessed via the standand Windows file API’s by any Windows application.
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Distributed SQLite.
LiteFS is a distributed file system that transparently replicates SQLite databases. You can run your application like it’s running against a local on-disk SQLite database but behind the scenes the database is replicated to all the nodes in your cluster. With LiteFS, you can run your database right next to your application on the edge. You can run LiteFS anywhere!
Tahoe-LAFS is a Free and Open decentralized cloud storage system. It distributes your data across multiple servers. Even if some of the servers fail or are taken over by an attacker, the entire file store continues to function correctly, preserving your privacy and security.
Btrfs Assistant is a GUI management tool to make managing a Btrfs filesystem easier.
SaunaFS is a distributed file system.
Welcome to SaunaFS, a robust distributed POSIX file system meticulously designed to revolutionize your storage solutions by offering unmatched efficiency, security, and redundancy. At its core, SaunaFS is a distributed file system primarily written in C++, inspired by the pioneering concepts introduced by Google File System.
A FUSE Filesystem for your Google calendar.
WhenFS turns your Google Calendar into a FUSE filesystem. It whimsically supports the following features:
- Create a filesystem out of existing Google Calendars, or create a new one from scratch
- Read and write files, directories and... well, just files and directories
- Mount your friends' WhenFS calendar file systems to share files in the silliest way possible
an open-source btrfs driver for Windows.
WinBtrfs is a Windows driver for the next-generation Linux filesystem Btrfs. A reimplementation from scratch, it contains no code from the Linux kernel, and should work on any version from Windows XP onwards. It is also included as part of the free operating system ReactOS.
Bcachefs is an advanced new filesystem for Linux, with an emphasis on reliability and robustness and the complete set of features one would expect from a modern filesystem.
Open Source Distributed POSIX File System for Cloud. JuiceFS is a distributed POSIX file system built on top of Redis and S3.
JuiceFS is a high-performance POSIX file system released under Apache License 2.0, particularly designed for the cloud-native environment. The data, stored via JuiceFS, will be persisted in Object Storage (e.g. Amazon S3), and the corresponding metadata can be persisted in various compatible database engines such as Redis, MySQL, and TiKV based on the scenarios and requirements.
With JuiceFS, massive cloud storage can be directly connected to big data, machine learning, artificial intelligence, and various application platforms in production environments. Without modifying code, the massive cloud storage can be used as efficiently as local storage.
Interactively find and recover deleted or 
overwritten 
files from your terminal.
PuzzleFS is a next-generation container filesystem.
Puzzlefs is a container filesystem designed to address the limitations of the existing OCI format. The main goals of the project are reduced duplication, reproducible image builds, direct mounting support and memory safety guarantees, some inspired by the OCIv2 design document.
simple, high-throughput file client for mounting an Amazon S3 bucket as a local file system.
Mountpoint for Amazon S3 is a simple, high-throughput file client for mounting an Amazon S3 bucket as a local file system. With Mountpoint for Amazon S3, your applications can access objects stored in Amazon S3 through file operations like open and read. Mountpoint for Amazon S3 automatically translates these operations into S3 object API calls, giving your applications access to the elastic storage and throughput of Amazon S3 through a file interface.
File system for GitHub & GitLab
HUBFS is a file system for GitHub and Git. Git repositories and their contents are represented as regular directories and files and are accessible by any application, without the application having any knowledge that it is really accessing a remote Git repository. The repositories are writable and allow editing files and running build operations.
GlusterFS is a scale-out network-attached storage file system. It has found applications including cloud computing, streaming media services, and content delivery networks. GlusterFS was developed originally by Gluster, Inc. and then by Red Hat, Inc., as a result of Red Hat acquiring Gluster in 2011.
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CryFS encrypts your files, so you can safely store them anywhere. It works well together with cloud services like Dropbox, iCloud, OneDrive and others.
BrowserFS is an in-browser filesystem that emulates the Node JS filesystem API and supports storing and retrieving files from various backends.
XtreemFS is a general purpose storage system and covers most storage needs in a single deployment. It is open-source, requires no special hardware or kernel modules, and can be mounted on Linux, Windows and OS X.