Here's a list of implementations for SIMAS, the Simple Assembly programming language.

Want to make your own implementation? Check out the official specifications

SIMASJS

The original implementation for SIMAS. Good for general purpose or web development.
SIMASJS

CMAS

Interpreter written in C. Used for low level programming.
CMAS

Objective-CMAS

SIMAS brought to Objective C. Low level performance with an extensible architecture and compatibility.
Objective-CMAS