Boost.Spirit
This is an older version and was released in 2016. The current version is 1.86.0.
C++
03
Added in Boost
1.30.0
LL parser framework represents parsers directly as EBNF grammars in inlined C++.
This Release
spirit
Spirit is a set of C++ libraries for parsing and output generation implemented as Domain Specific Embedded Languages (DSEL) using Expression templates and Template Meta-Programming. The Spirit libraries enable a target grammar to be written exclusively in C++. Inline grammar specifications can mix freely with other C++ code and, thanks to the generative power of C++ templates, are immediately executable.