GFA BASIC — Was originally conceived on the Atari ST where it became one of the most popular BASICs for that platform. Was later ported to the Amiga, MS-DOS and Windows.
Microsoft BASIC (overview of Microsoft BASIC variants) (many microcomputer platforms)
PowerBasic — Efficient commercial basic compiler for DOS and Windows (successor of Turbo BASIC) — With Compiler. (MSDOS, Win32)
PureBasic — Cross-plattform application development language. Fast compiled basic with many functions. Available for Microsoft Windows, Linux, AmigaOS and Mac OS (in development).
RapidQ is a free BASIC that borrowed from Visual Basic. Useful for graphical surfaces. Works to a large extent with QuickBasic instructions. It is possible to write programs for Windows, Linux, Solaris/Sparc and HP/UX. (Cross-platform, free, no longer being developed). Semi-oo interpreter. Includes RADIDE.
Lightning Extended BASIC — This patched Mallard BASIC to allow sophisticated graphics (for the time) to be drawn on screen, saved to disc, printed, et cetera.
MOLE Basic — Merty's Own Language Extension Basic.
QBASIC — Came with versions of MS-DOS from 5.0 to 6.22.
QuickBasic — Extended QBasic Variant (to be more precice, QBasic is a reduced QuickBasic) . Was the commercial version of Qbasic. Came with a compiler.
Gnome Basic is a project to develop a Visual Basic compatible clone BASIC for Gnome. During the course of development, the project was discontinued, and VB.NET support for Mono was dropped.
Integer BASIC — Steve Wozniak's own creation. Was originally known simply as "Apple BASIC". For the BASICs available at the time, it was extremely fast and memory-efficient. Only supported integers. Came as standard on the Apple I and original Apple II
MBASIC — Further development of OBASIC, also from Microsoft. MBasic was one of the BASICs developed from Microsoft. Came with a line editor), that for example ran under CP/M.
TRS-80
Color BASIC (Tandy Radio Shack TRS-80 Color Computer, aka CoCo)
TRS-80 Level I BASIC (TRS-80) (based on TinyBASIC )
TRS-80 Level II BASIC (Tandy/Radio-Shack TRS-80) (based on Microsoft BASIC)
Microsoft Level III BASIC (Tandy/Radio-Shack TRS-80)