Bison
Bison is a parser generator tool that converts a grammar description for a context-free language into a C, C++, or Java program to parse that language. It is part of the GNU Project and is widely used for building compilers, interpreters, and other language processing tools by automating the creation of parsers from formal grammar specifications.
Developers should learn Bison when working on projects that involve parsing structured text, such as implementing programming languages, configuration file readers, or domain-specific languages (DSLs). It is particularly useful in compiler construction, where it helps generate efficient bottom-up parsers (typically LALR or GLR) from grammar rules, reducing manual coding errors and speeding up development.