Similar to Ren'Py

DigiKam

Discourse (software)

Dlib

Docker (software)

Dolphin (file manager)

Dolphin (emulator)

Dragon Player

Drupal

DSpace

Device independent file format#DVI-to-PDF converters

Dvips

Eclipse (software)

EGS (program)

Emacs

Erlang (programming language)

Mule (software)

Etherpad

GNOME Evolution

EZ Publish

F-Spot

Far Manager