Franco Maria Nardini, one of the SIGIR’19 Learning to Rank tutorial designers and presenters, kindly shared these links in subsequent communications, which are going to be helpful to anyone interested in learning to rank.
I can highly recommend these, especially the tutorial materials (4) and QickRank (2), which is implemented in ISO C++, compiles beautifully with cmake, and is a pristine example of a well-engineered and easy-to-use software tool.
1) http://rankeval.isti.cnr.it/
2) http://quickrank.isti.cnr.it/
3) http://learningtorank.isti.cnr.it/
4) http://ltr-tutorial-sigir19.isti.cnr.it/