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2. Unix - Wikipedia

   en.wikipedia.org/wiki/Unix

   The Unix system is composed of several components that were originally packaged together. By including the development environment, libraries, documents and the portable, modifiable source code for all of these components, in addition to the kernel of an operating system, Unix was a self-contained software system. This was one of the key ...

3. GNU Project - Wikipedia

   en.wikipedia.org/wiki/GNU_Project

   The first goal of the GNU Project was to create a whole free-software operating system. Because UNIX was already widespread and ran on more powerful machines, compared to contemporary CP/M or MS-DOS machines of time, [18] it was decided it would be a Unix-like operating system. Richard Stallman later commented that he considered MS-DOS "a toy".

4. FreeBSD - Wikipedia

   en.wikipedia.org/wiki/FreeBSD

   FreeBSD is a free-software Unix-like operating system descended from the Berkeley Software Distribution (BSD). The first version was released in 1993 developed from 386BSD [3] —the first fully functional and free Unix clone—and has since continuously been the most commonly used BSD-derived operating system.

5. Ken Thompson - Wikipedia

   en.wikipedia.org/wiki/Ken_Thompson

   On April 27, 1999, Thompson and Ritchie jointly received the 1998 National Medal of Technology from President Bill Clinton for co-inventing the UNIX operating system and the C programming language which together have "led to enormous advances in computer hardware, software, and networking systems and stimulated growth of an entire industry ...

6. GNU toolchain - Wikipedia

   en.wikipedia.org/wiki/GNU_toolchain

   Cross compiler – Cross-platform machine-code compiler; Cygwin – Unix-like environment for Windows; Git – Distributed version control software system; GNU Classpath – Implementation of standard class library of Java; GNU Core Utilities – Package of software containing basic utilities used on Unix-like operating systems

7. Binary-code compatibility - Wikipedia

   en.wikipedia.org/wiki/Binary-code_compatibility

   Binary compatible operating systems are OSes that aim to implement binary compatibility with another OS, or another variant of the same brand. This means that they are ABI-compatible (for application binary interface). As the job of an OS is to run programs, the instruction set architectures running the OSes have to be the same or compatible.

8. Flex (lexical analyser generator) - Wikipedia

   en.wikipedia.org/wiki/Flex_(lexical_analyser...

   Flex (fast lexical analyzer generator) is a free and open-source software alternative to lex. [2] It is a computer program that generates lexical analyzers (also known as "scanners" or "lexers").

9. dbx (debugger) - Wikipedia

   en.wikipedia.org/wiki/Dbx_(debugger)

   Free for download and use as described in the Sun Studio product license. dbx is a source-level debugger found primarily on Solaris , AIX , IRIX , Tru64 UNIX , Linux and BSD operating systems. It provides symbolic debugging for programs written in C , C++ , Fortran , Pascal and Java .