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If S3QL does not suit your needs, you might be interested in one of the following projects. (Note that there are several projects named s3fs.)

• OpenDedup. An open source de-duplicating file system that also has an S3 backend.

• LessFS. An open source de-duplicating file system without network storage support.

• s3fs implements basic filesystem support, including large files.

• S3FSLite is a fork of the above-mentioned s3fs.

• s3fs-python Stores data in Amazon S3. Compression support, no data-duplication. No development since 2011.

• S3backer exposes S3 as a virtual block device. You can use it with any filesystem you want.

• ObjectiveFS; a commercial AWS S3 file system. It allows file systems to be mounted simultaneously on multiple computers.

• JungleDisk; the oldest of the s3 file systems. Commercial.

• With EBS one can access S3 buckets as block-devices on EC2 instances. Since the block device exists "within AWS" on the EC2 instance, this circumvents many principal problems that S3Backer faces. From the EC2 instance, a created filesystem can then be exported using any network filesystem (e.g. sshfs).

• Quillen is a snapshot-based backup program that stores its data directly in S3.

• goofys offers better performance but less POSIX support

• Rclone; rsync-like tool to sync files to/from/between cloud providers. Also supports mounting. Less posix support.

• S3Drive; Android/iOS/Desktop app to mount cloud storage, and to sync or back up files regularly. Compatible with Rclone.