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Fast Library for Number Theory

Ffdshow

FFmpeg

Fastest Fourier Transform in the West

FIGlet

File System Visualizer

Filesystem in Userspace

Flatpak

Foliate (software)

Fontconfig

FontForge

Fossil (software)

Free Pascal

FreeBASIC

FreeMat

GD Graphics Library

Gephi

GLib

GNOME

GNOME Terminal

GNOME Calculator

GNU Core Utilities

GNU GRUB

GNU Pascal

GNU Readline

GNU Taler

GnuCash

Glibc