Elote
A python package for rating competitors based on bouts. The classical example of this would be rating chess players based on repeated head to head matches between different players. The first rating system implemented in elote, the Elo rating system, was made for just that [3]. Another well known use case would be for college football rankings.
There are a whole bunch of other use-cases for this sort of system other than sports though, including collaborative ranking from a group (for voting, prioritizing, or other similar activities).
Currently implemented rating systems are:
Elo [3]
Glicko-1 [1]
ECF [4]
DWZ [5]
Ensemble