The source code from mineplex 2018 leak with commit history dating back to 2014, it requires a lengthy setup to get functional but is a reasonably easy compile if you know what your doing just have to repatch the spigot
* commit '51d152d48473f820ab6d03586fb41f890750f645':
Perfect build all fix
Only eliminated players are guardians. Broken blocks/mobs go directly into inventory.
Stop mid game joiners from getting participation gems.
Mob egg baby fix. Also fixed non build entities from being "broken"
spec command add guardian
The infamous look direction bounce bug
Chiss' double jump mechanic
Moar fixes
Hopper item pickup fix.
2eeddb828b