Downloading Fuse4X 0.9.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The application lies within System Tools, more precisely File Compression. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application is a product of fuse4x.
From the developer:
Fuse4X allows you to extend Mac OS X's native file handling capabilities via 3rd-party file systems. As a developer, you can use the Fuse4X SDK to write numerous types of new file systems as regular user-mode 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.
You may want to check out more software for Mac, such as sshFS Dingus, which might be related to Fuse4X.