Similar to Ren'Py

JACK Audio Connection Kit

Jigdo

Kawa (Scheme implementation)

MapServer

Marmalade (software)

Miro (video software)

Mumble (software)

Nginx

Apache Flex

GameMaker

GDevelop

GtkRadiant

KiriKiri

Be-Music Source

Irrlicht Engine

SCUMM

CryEngine