Similar to GNU_Octave

Device independent file format#DVI-to-PDF converters

Dvips

EGS (program)

Emacs

Embedded GLIBC

Enlightened Sound Daemon

ERP5

Mule (software)

Etherpad

GNOME Evolution

Exa (command-line utility)

XMPP

EZ Publish

F-Spot

Fast Library for Number Theory

Fetchmail

FFmpeg

FIGlet

File System Visualizer

Filesystem in Userspace

FindBugs

Firebird (database server)

Firestarter (firewall)