The HAL/S programming language is used in the general purpose computers in the space shuttle. I have written a simple HAL/S program of my own. Is there any compiler available to turn it into executable form?
In general: if there are any compilers still extant for HAL/S, then they are under the care and responsibility of the United Space Alliance, which has published a specification. There are no HAL/S available as e.g. open source.
More specifically: the question can not completely be answered, as the request for a compiler always includes a target architecture, e.g. "Linux x64".