NECI
The FCIQMC software I helped develop during my PhD
During my PhD, I was one of the lead developers of the https://www2.fkf.mpg.de/alavi/neci/stable/index.html full configuration interaction quantum Monte Carlo (FCIQMC) software. This is a mature, highly parallelised Fortran library that performs the algorithm and its many different variants. I was particularly involved in support for the transcorrelated method, as well as improved coding standards and the introduction of a website (see link above).