Collectl is a light-weight performance monitoring tool capable of reporting interactively as well as logging to disk. It reports statistics on cpu, disk, infiniband, lustre, memory, network, nfs, process, quadrics, slabs and more in easy to read format.
github: https://github.com/ThomasCX/defragfs The defragfs project aims on file-system/directory defragmentation of the Linux operating system, it is (currently) file-system independent and only CLI, hope further development could bring the GUI and better functionality.
LftpFS is FUSE filesystem with caching for smart mirror of sites. Useful for mirroring of Linux repositories. It's based on LFTP client, which supports FTP, HTTP, FISH, SFTP, HTTPS, FTPS protocols and works over proxies.
js3fs, "Just a S3 File System", is a Jungle Disk compatible FUSE-based filesystem using Amazon S3.