Similar to GNU_Privacy_Guard

Elasticsearch

EGS (program)

Element (software)

Emacs

Enlightened Sound Daemon

Erlang (programming language)

ERP5

Mule (software)

Etherpad

Euler Mathematical Toolbox

Exa (command-line utility)

Exaile

EZ Publish

Falkon

Far Manager

Fast Library for Number Theory

Fetchmail

FFmpeg

Fastest Fourier Transform in the West

Filesystem in Userspace

FindBugs

Firebird (database server)

Firestarter (firewall)

Firewalld