An ongoing project we have is to ensure more popular, well-known C++ libraries are updated to work with C++Builder, and available to you from within GetIt, our package manager. You may have seen a post earlier this year about real-world (non-demo) apps that you can use with C++Builder and CMake, for example, and this is related.
This week, I'd like to highlight TinyXML 2.
TinyXML is "simple, small, efficient, C++ XML parser", to quote the github page, and is designed for easy integration into applications. It's widely used as a lightweight XML parser.
It's available in GetIt.
When you use RAD Studio, you can mix C++ and Delphi code together. I have a blog post, video, and example source code for doing so, in both directions - adding Delphi to C++, and adding C++ to Delphi! If you want to make use of C++ libraries from within Delphi, check those out, and look into making use of RAD Studio.