Mods

TickrateChanger
Link: https://www.curseforge.com/minecraft/mc-mods/tickratechanger/files


 * Ability to change the tickrate, which is useful for testing jumps.

MPKmod
Link: https://github.com/kurrycat2004/MpkMod


 * Detailed GUI showing coordinates, jump offset, timings, and more.


 * Built-in macro editor (singleplayer only).