Distributed, RESTful search and analytics engine

https://www.elastic.co/

Functional, meta-programming aware language built on top of Erlang VM

https://elixir-lang.org/

Elvish = Expressive Programming Language + Versatile Interactive Shell

https://elv.sh/

GNU editing macros (No X flavor)

https://www.gnu.org/software/emacs/

GNU editing macros (No X flavor)

https://www.gnu.org/software/emacs/

Media server to organize, play & stream audio/video to various devices

https://emby.media/

Expect-like tool for pure shell

https://empty.sourceforge.net/

Enhanced Motif WM fork with multi-monitor and utf-8 support

http://fastestcode.org/emwm.html

Collection of helper tools for emwm

http://fastestcode.org/emwm.html

Detect encoding of text files

http://gitorious.org/enca

Dictionary/spellchecking framework

https://www.abisource.com/projects/enchant/

Dictionary/spellchecking framework

https://abiword.github.io/enchant/

X.Org Encoding fonts

https://www.x.org/

High-performance, zero maintenance encrypted DNS proxy

https://github.com/jedisct1/encrypted-dns-server

Artistic and fast X window manager

https://www.enlightenment.org/

ASCII to PostScript filter

http://www.gnu.org/software/enscript/

ASCII to PostScript filter

http://www.gnu.org/software/enscript/

Runs arbitrary commands when files change

https://eradman.com/entrproject

Shell helper that automatically sets and unsets environment variables

https://github.com/wojas/envy

The Eye Of Gnome image viewer

https://wiki.gnome.org/Apps/EyeOfGnome

Plug-ins for the Eye of GNOME image viewer application

Extremely lightweight and simple web browser for GNOME

https://www.gnome.org/projects/epiphany/

Free UNIX software/file packaging program

https://www.msweet.org/epm/

Functional programming language from Ericsson

https://www.erlang.org/

IDNA implementation in pure Erlang

https://github.com/benoitc/erlang-idna

Manual pages for Erlang/OTP

https://www.erlang.org/

Functional programming language from Ericsson

https://www.erlang.org/

Functional programming language from Ericsson

https://www.erlang.org/

Functional programming language from Ericsson

https://www.erlang.org/

Compatibility library for unicode_util from Erlang R20

https://github.com/benoitc/unicode_util_compat

Extensible shell, derived from plan9's rc

http://wryun.github.io/es-shell/

Sound library for enlightenment package

https://www.tux.org/~ricdude/EsounD.html

Software speech synthesizer

http://espeak.sourceforge.net/

Software speech synthesizer

https://github.com/espeak-ng/espeak-ng/

Additional loader for Evas (svg)

http://trac.enlightenment.org/e/wiki/Evas_Generic_Loaders

Input event device header files

VTE based, super lightweight terminal emulator

http://www.calno.com/evilvte/

GNOME 3 multi-format document viewer

https://wiki.gnome.org/Apps/Evince

Integrated mail, calendar and address book distributed suite

https://wiki.gnome.org/Apps/Evolution

Data backends for the Evolution integrated mail/PIM suite

https://wiki.gnome.org/Apps/Evolution

Evolution Microsoft Exchange plugin through Exchange Web Services

https://wiki.gnome.org/Apps/Evolution

Modern replacement for ls

https://the.exa.website/

Full featured python-based music player for GTK+

https://www.exaile.org/

Lightweight non-interactive sh(1)-like scripting language

https://www.skarnet.org/software/execline/

Port of Adobe XMP SDK to work on UNIX

http://libopenraw.freedesktop.org/wiki/Exempi

Command line utility to read and manipulate EXIF data

https://libexif.github.io/ https://github.com/libexif/exif

Exif, IPTC, and XMP metadata manipulation library and tools

https://www.exiv2.org/

Geometric sans serif font with a technological feel

http://www.ndiscovered.com/

XML 1.0 parser written in C

https://github.com/libexpat/libexpat

Sophisticated scripter based on Tcl/Tk

https://expect.sourceforge.net