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

With the 2021.1 release, we are dropping support for 32-bit systems. We will continue to create patch releases to the 110.99 version when there are critical bugs to fix. For the next release (2022.1), we plan to add support for the Arm64 architecture and hope to include support for 64-bit Windows on the AMD64 architecture.

Support for 64-bit architectures

The latest version (110.99.3) 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

As of July 2022, we are using GitHub issues to track bug reports and feature requests. We have migrated the existing bug database from our previous bug-tracking system to issues.

Note that to submit a bug, you will need a GitHub account.



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).

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