wxBASIC

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wxWindows is an open source GUI framework to make cross-platform programming. wxWindows gives a single, easy-to-use API for writing GUI applications on multiple platforms. Link with the appropriate library for your platform (Windows/Unix/Mac, others coming shortly) and compiler (almost any popular C++ compiler), and the application will adopt the look and feel appropriate to that platform. wxBasic is a free, cross platform Basic interpreter that can generate stand-alone GUI executables for Windows and Linux. It combines the simplicity of Basic with the portability of the cross-platform wxWindows library.
May 2006. New version: many bugs corrected and some new features added.

Windows, Linux, MacOS