Linux file system (FUSE) to access Dropbox, Sugarsync, Amazon S3, Google Storage, Google Drive or WebDAV servers.
http://joe42.github.com/CloudFusion/
https://github.com/joe42/CloudFusion

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Fuse也是一個辦法：

A FUSE wrapper around MongoDB‘s GridFS
https://github.com/mikejs/gridfs-fuse

A Usermode Hookable Filesystem Library
http://osrg.github.io/earthquake/subprojects/
https://github.com/osrg/hookfs

Rust library for filesystems in userspace (FUSE)
https://github.com/zargony/rust-fuse

a FUSE file system based on Google Drive rust
https://github.com/harababurel/gcsf

An innovative FUSE wrapper for Google Drive. Python

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CloudFusion，支持Dropbox, Sugarsync, Amazon S3, Google Storage, Google Drive or WebDAV