BlitzMax
   BlitzMax is a game programming language from Blitz Research that is based on the BASIC programming language.
   http://blitzbasic.com/Products/blitzmax.php

Chipmunk BASIC
   An old-fashion BASIC interperter for the Macintosh.
   http://www.nicholson.com/rhn/basic/

METAL BASIC
   METAL is a free modern extended BASIC metacompiler for PowerMac used in scientific research, development and K-12 education.
   http://www.iit.edu/~sarimar/GDS/

Omikron Basic
   an efficient and powerful programming language for sophisticated software development. Ideal for scientific and engineering purposes.
   http://www.berkhan.com/basic/start_e.htm

TNT Basic
   TNT Basic's amazingly easy to use development environment allows you to compose all your game's graphics, sounds, music and code with simplicity and ease.
   http://www.tntbasic.com

VIP BASIC
   Visual Interactive Programming for BASIC. It can create 68k or PPC applications. Good for extensive database programming, but it builds excessively large applications and is slow at most things. May not be good for creating many kinds of games.
   http://www.mstay.com/legacy.html