SML/NJ Standard ML of New Jersey                          

Standard ML of New Jersey (abbreviated SML/NJ) is a compiler for the Standard ML '97 programming language with associated libraries, tools, and documentation. SML/NJ is free, open source software.

What's New

Future Plans

We are planning a major change in the system, where we will be dropping support for 32-bit architectures and switching to LLVM for code generation (see A New Backend for Standard ML of New Jersey for details). We will continue to create patch releases to the 110.99 version when there are critical bugs to fix.

With this major change, we are also going to change the way that we assign version numbers, where versions will have a major number determined by the year and a minor number determined by the release number for that year. We expect that the next release will be numbered 2021.1, since it will be the first release of 2021.

Support for 64-bit architectures

The latest version (110.99.2) supports 64-bit executables on macOS and Linux.


Subversion access

Our master source repository is kept on a FusionForge server (a successor to GForge) under Subversion control. We provide anonymous read-only access to the repository, so anyone can download a snapshot of the most recent sources at any time. Instructions are here.


Documentation and Literature

Reporting Bugs



This project is based upon work supported in part by the National Science Foundation under Grant No. CNS-0454136.

Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).

Send comments to smlnj-dev-list
Copyright © 2004-2020, SML/NJ Fellowship.