Speed Dreams, often shortened to SD and formerly known as Torcs-NG, is a free and open source 3D racing video game for Linux, Microsoft Windows, AmigaOS 4, AROS, MorphOS and Haiku. Started in 2008 as a fork of the racing car simulator TORCS, it is mainly written in C++ and released under GPL v2+ and Free Art License, the most recent release being version 2.2.3 of August 2021. The development of an accurate driving behaviour, with different physics engines available, sets the project among the few open source racing simulation codebases.