Of the available BASIC dialects, my site provide in-depth information on the 3 most popular products ( PowerBASIC, REALbasic and PureBASIC) along with information to help you choose between the products.

Most Popular All three of these provide a VB6-like visual designer capabilities, are event driven, and provide limited object-oriented programming features.
	PowerBASIC	$200 ($300 w/Visual Designer)
	PureBasic	$100
	REALbasic	$100
Additional BASIC Products While capable of creating Windows applications, there products are generally more limited and less popular with programmers than the 'Most Popular' products listed above.
	BBC BASIC	$50
	BlitzMax/Blitz3D/BlitzPlus	$80/$100/$60 (games/3D)
	Business Basic (BBx)	$--
	DarkBASIC	$40 (games)
	ethosBASIC	$50 (games)
	HotBasic	$90
	KBasic	($35)
	Liberty BASIC	($50)
	True BASIC	$40-$495
Command Line Only These are limited to operating from the DOS command line only. They cannot produce Windows applications.
	BBC BASIC	$50
	BlitzMax/Blitz3D/BlitzPlus	$80/$100/$60 (games/3D)
	Business Basic (BBx)	$--
	DarkBASIC	$40 (games)
	ethosBASIC	$50 (games)
	HotBasic	$90
	KBasic	($35)
	Liberty BASIC	($50)
	True BASIC	$40-$495
Free There a wide variety of free versions of BASIC which can create standard Windows executables. Many focus on providing easy-to-use graphics capabilities for creating games.
	AutoIt
	Basic4GL	(3D/games)
	CoolBasic	(games)
	freeBASIC	QuickBasic compatible
	JustBasic
	sdlBasic	(games, interpreter only)
	SmallBASIC
	thinBasic	(interpreter only)
	wxBasic	(interpreter only)
Scripting These products may be used inside applications to provide scripting capabilities.
	Aurel Basic
	FBSL
	ScriptBasic
Inactive/No Recent Updates While still available, these products are inactive.
	GFA Basic
	GamesBasic
	HiSoft Basic
	KoolB
	RapidQ	$free
	Yabasic	free