colorForth is a minimalist programming environment that includes its own operating system in just 2K bytes of code. Developed by Charles Moore, the language uses color-coded syntax instead of traditional punctuation, with red words defining new functions and green words compiling code. The system runs on both Pentium processors and Forth microprocessor chips.

Unlike standard Forth implementations, colorForth doesn't conform to the ANS Forth Standard but instead optimizes for the specific instruction sets of Moore's hardware. The editor features pre-parsed source code where each word starts with 4 bits indicating color and function, followed by 28 bits of Shannon-coded characters. This design enables instantaneous compilation and reduces source code size dramatically.

Applications in colorForth typically require only 1% of the code needed for equivalent C programs. The system boots by copying disk contents into RAM, then compiles macros to emulate the stack machine Forth expects. With modern computers' abundant RAM, colorForth demonstrates that traditional operating systems may be unnecessary overhead. The 40x24 character display uses large, readable fonts and supports graphics, images, and 3D shapes through additional coding.