Legacy

B, short for Programming Language B, is a procedural programming language created by Ken Thompson at Bell Labs in 1969. B was developed as a simplified version of BCPL, intended for system and operating system programming on early Unix systems. Historical implementations and documentation can be accessed at the B Language Historical Resources.

Visual COBOL, short for Micro Focus Visual COBOL, is a commercial implementation of the COBOL programming language that integrates modern development tools, IDEs, and compiler technologies. It was developed by Micro Focus in the early 2000s as an evolution of traditional COBOL to support enterprise applications across multiple platforms, including Windows, Linux, and the .NET and JVM environments. Visual COBOL is widely used in business-critical applications such as banking, insurance, and ERP systems.

OpenCOBOL, short for OpenCOBOL Compiler, is an open-source COBOL compiler that translates COBOL code into C and then compiles it with a native C compiler. It was created as a free alternative to commercial COBOL implementations and has been actively maintained since the early 2000s. OpenCOBOL is used for legacy business applications, payroll systems, and financial software.

GnuCOBOL, short for GnuCOBOL Compiler, is an open-source implementation of the COBOL programming language that converts COBOL code into C and then compiles it using a native C compiler. It originated from OpenCOBOL and has been actively developed since 2002. GnuCOBOL is used in legacy business applications, batch processing, financial systems, and government systems.

COBOL, short for Common Business-Oriented Language, is a high-level programming language developed by a committee of computer scientists and industry experts led by Grace Hopper in 1959. it was designed for business, finance, and administrative systems, running primarily on mainframes and enterprise servers. COBOL is used in legacy banking systems, payroll applications, and government data processing. modern compilers such as GnuCOBOL allow compiling COBOL programs on Unix, Linux, and Windows platforms.