Editing Turing (programming language) (section)

==Open implementations==

Currently, there are two open source alternative implementations of Turing: Open Turing, an open source version of the original [[Interpreter (computing)|interpreter]], and [[#TPlus|TPlus]], a native compiler for the concurrent system programming language variant [[#Turing+|Turing+]]. [[#OpenT|OpenT]], a project to develop a Turing compiler, was discontinued.

===Open Turing===

Open Turing is an open-source implementation of the original Turing interpreter for Windows written by Tristan Hume. It includes speed improvements, new features such as OpenGL 3D and a new code editor. It is fully backwards compatible with the closed-source implementation.<ref>{{cite web|last=Hume|first=Tristan|title=Open Turing|url=http://tristan.hume.ca/openturing/|access-date=6 May 2012}}</ref>

===TPlus===
TPlus is an open-source implementation of original (non-Object-Oriented) Turing with systems programming extensions developed at the University of Toronto and ported to [[Linux]], [[Oracle Solaris|Solaris]], and [[macOS|Mac OS X]] at [[Queen's University at Kingston|Queen's University]] in the late 1990s.<ref>{{cite web|last=Cordy|first=James|title=Turing+ 6.1|url=http://txl.ca/txl-tplusdownload.html|access-date=11 December 2020}}</ref> TPlus implements [[#Turing+|Turing+]] (Turing Plus), a concurrent systems programming language based on the original Turing programming language. Some, but not all, of the features of Turing Plus were eventually subsumed into the present [[#Object-Oriented Turing|Object-Oriented Turing]] language. Turing Plus extends original Turing with [[Process (computing)|processes]], [[Monitor (synchronization)|monitors]] (as specified by [[C.A.R. Hoare]]), and language constructs needed for system programming such as binary input-output, separate compiling, variables at absolute addresses, type converters and other features.