CodeArchaeology

The BASIC dialect that put a DirectX 7 scene graph behind keywords — Mark Sibly's 2001 compiler let a beginner open a 3D window, load a mesh and render it in a dozen lines, and it is still the engine behind SCP – Containment Breach.

An open-source isomorphic BASIC cross-compiler by Marco Spedaletti that turns one source file into native 6502, 6809, 6309, Z80 and SM83 assembly for dozens of 8-bit home computers and consoles.

A Windows BASIC dialect built for 2D game programming, with sprites, maps, collision and a bytecode virtual machine, developed by Kevin Picone since the early 2000s.

A free, open-source teaching BASIC that puts an editor, a text window and a graphics canvas on one screen, so a beginner can draw, animate and make sound within minutes of starting.

A cross-platform game-development kit from the makers of DarkBASIC, whose BASIC-derived AppGameKit Script compiles to bytecode that runs on per-platform players, with a C++ tier underneath for native projects.

The assembly language of the Intel 8080, the April 1974 microprocessor behind the Altair 8800, CP/M and Altair BASIC, whose mnemonics and register model carried over into the 8085, the Z80 and x86.