Similar to Graphviz

DVD Flick

Device independent file format#DVI-to-PDF converters

Dvips

Elasticsearch

EGS (program)

Enlightened Sound Daemon

Erlang (programming language)

ERP5

Mule (software)

Etherpad

Exa (command-line utility)

Exaile

EZ Publish

Far Manager

Fetchmail

Fastest Fourier Transform in the West

FindBugs

Firebird (database server)

Firestarter (firewall)

Firewalld