Similar to GeoServer

Exaile

Expr

EZ Publish

F-Spot

Falkon

Far Manager

Fast Library for Number Theory

Ffdshow

FFmpeg

Fastest Fourier Transform in the West

FIGlet

File System Visualizer

Filesystem in Userspace

Firebird (database server)

Firewalld

Flask (web framework)

Flatpak

FLTK

Flutter (software)

FMSX

Foliate (software)

Fontconfig

FontForge

Foresight Linux

Fossil (software)