The ENBD (Enhanced Network Block Device) is an industrial-strength version of the Linux kernel NBD. It makes a remote disk look like a local block device, allowing cheap and safe realtime mirrors to be built over the net. It features internal block-journalling and multichannel failover.
Fairsched is a hierarchical fair CPU scheduler. Processes are divided into groups and each group receives guaranteed CPU time allocation proportional to its weight. The standard scheduler is used to schedule processes within a group. It can be used to divide CPU time fairly among users or for more flexible CPU time allocation on busy computing servers.
Fd Linux is a mini floppy distribution of Linux set to fit on 1 floppy disk (kernel and root fs are combined). The sole purpose of this floppy distribution is to provide new Linux users with low-end machines (such as a 386) a very useful set of networking related binaries that can be easily accessed at any time, and which can be used in almost any networked environment (libraries, colleges, offices, small home LANs, dorm rooms, etc.).
Fiasco is a microkernel with real-time capabilities running on the x86 and ARM platforms. It is compatible with the L4 microkernel, which has set standards in microkernel performance and functionality. Fiasco is a fully-featured and secure L4 implementation with excellent real-time properties. It can run L4Linux, a port of the Linux kernel to the L4 interface which executes completely in user mode. The screenshot shows the DOpE real-time windowing environment running on top of Fiasco, with an instance of L4Linux running in one of the windows.
fistgen is the FiST language code generator, used to create stackable file systems out of templates and a high-level language. This package comes with stackable file system templates for Linux, Solaris, and FreeBSD. It also contains several sample file systems built using the FiST language: an encryption file system, a compression file system, and more - all of which are written as portable stackable file systems.