cppnest is a fully-fledged atomistic nested sampling code written in C++. It is specifically tailored for simple interatomic pair potentials like Lennard-Jones or the Jagla model. I used cppnest heavily in my RENS study. Unfortunately, I never found the time to clean the code appropriately and bring it in a publishable state. In case, I find the time to pick it up again at some point, I will put a link to a repository here!

Find cppnest here: https://github.com/nunglert/cppnest.