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

Chiss a198d0d3cb Added events...		2013-08-29 16:16:22 +10:00
Maps	Bob wants to play!	2013-08-29 15:55:49 +10:00
Nautilus.Core.VoteHub	Initial Commit	2013-08-27 08:14:08 -07:00
Plugins	Added events...	2013-08-29 16:16:22 +10:00
TestApps/LOCTester	Initial Commit	2013-08-27 08:14:08 -07:00
TexturePack	Initial Commit	2013-08-27 08:14:08 -07:00
Webserver/ServerHandler	Initial Commit	2013-08-27 08:14:08 -07:00
Website	Removed class files from source control.	2013-08-27 16:21:57 -07:00