You could have downloaded BlitzMax 1.3 for Mac from our software library for free. The software lies within Developer Tools, more precisely IDE. The actual developer of this software for Mac is Blitz Research.
From the developer:
BlitzMax is the next generation game programming language from Blitz Research. BlitzMax retains the BASIC roots of Blitz3D and BlitzPlus, but adds a ton of cool new features and abilities.
BlitzMax is BASIC...
You may want to check out more Mac applications, such as Objective Basic, Pleinpot or PLCEdit, which might be related to BlitzMax.
IDE