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OTRI, the Open Trail Running Index

An open calculator and scoring tool for trail running: a course file (GPX) and a results file in, an explained, reproducible score for every finisher out. Free to score, public to view, open to inspect. The calculator and the race pages need JavaScript; these pages do not:

Frequently asked questions: what a score means, which races can be scored, courses and GPX files, the runner index, publishing a race.
How a score is made: the model, every constant, and what it does not see.
What is a GPX file? and Result files: what to bring.
Privacy, Terms, Data policy.

The code and the methodology are on GitHub.