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CakeML is a verified REPL interpreter implementation of a significant subset of Standard ML.
- Simplified BSD License
HaMLet is a faithful and complete implementation of the Standard ML programming language (SML'97). It aims to be an accurate reference implementation of the language specification, a platform for experimentation with the language semantics or extensions to it, and a useful tool for educational purposes.
- custom license
Isabelle is a generic proof assistant. It allows mathematical formulas to be expressed in a formal language and provides tools for proving those formulas in a logical calculus.
- Revised BSD License
MLton is an open-source, whole-program, optimizing Standard ML compiler.
- Python Imaging Library License (modified)
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 License