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Filesystem in Userspace

FindBugs

Firebird (database server)

Firestarter (firewall)

Firewalld

Flatpak

FLTK

Fluxbox

FMSX

Foliate (software)

Fontconfig

Free Pascal

FreeBASIC

FreeMat

FreeS/WAN

Fsck

FuelPHP

FVWM

Galaxy (computational biology)