Libsqlfs is a library used in conjunction with SQLite that allows applications to put an entire read/write file system into a relational database as a single file in the host filesystem. Such a filesystem-in-a-file can easily be moved around, backed up, or restored as a single file. The filesystem can also be accessed as individual files through FUSE (File System in User Space). This provides great flexibility and convenience. File system accesses can be batched into atomic transactions (either all the updates are done, or none of them are). Libsqlfs was created as part of the "ACCESS Linux Platform", and it will be useful in many other applications.
loggerfs is a FUSE-based virtual file system that automatically parses log files and sends that information to a MySQL or PostgreSQL database. Existing log parsers usually run periodically and scan the entire file for changes. loggerfs takes a different approach by providing a virtual file system. Whenever data is appended to a virtual file by the logging daemon, the information is directly stored in the database. There is no need to poll the file and monitor for changes.
m9u is a music server, similar to mpd or xmms2. It sits in the background, waiting for commands to be delivered via a 9p file system. m9u embraces the Unix philosophy of doing one thing well. As such, it does not try to catalog or otherwise organize music, but aims for the more humble goal of simply playing it. A side effect of this approach is that m9u is trivially extensible to domains aside from music (for example, an image slideshow).
makebootfat is a tool to make bootable USB disks. It can autodetect, partition, format, and populate the USB disk in a single step without any user interaction. It can also create disk images which are simultaneously compatible with all the three USB booting standards: USB-FDD, USB-HDD, and USB-ZIP.