Download of HLSL2GLSL 0.9 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The program is categorized as Audio & Video Tools.
From the developer:
HLSL2GLSL is a command-line tool and library that translates HLSL shaders into GLSL. HLSL2GLSL can be used as a stand-alone command-line tool to directly translate shader source from HLSL to GLSL.
In addition, HLSL2GLSL is a DLL (with full source-code included) that can be used directly by a developer in an application.