Sports Organization Management. The only ones I have seen have not had many updates lately, zuluru and doubleheader.

I was able to get zuluru to run via docker but had to really play with it and use older docker images for mysql and its php base image as the repo's docker compose file relied on latest tags. It has a lot of nice features for managing a team org but its UI is rather simple/dated. https://github.com/Zuluru/Zuluru3

Have not gotten doubleheader up yet but plan to try soon but its repo has not been updated for almost 3yrs. https://github.com/harisjlatif/doubleheader