TinyXML2 is a simple, small, efficient, C++ XML parser that can be easily integrated into other programs.
ZLIB License
TOML for Modern C++
Compile time static reflection C++ ORM(mysql,pgsql,sqlite), the character recognition type system...
A modern formatting library
Light-weight, simple and fast XML parser for C++ with XPath support
Tiny but powerful single file wavefront obj loader
Header-only TOML config file parser and serializer for C++17.
Header only C++11 tiny glTF 2.0 library
Mainly a syntax-aware diff that also provides a number of additional tools.
A C++ header-only HTTP/HTTPS server and client library