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 7ab04be00c Added Hub Parties ... Re-did Hub Tutorials Added Party Tutorial		2013-09-07 14:09:12 +10:00
Maps	Bob wants to play!	2013-08-29 15:55:49 +10:00
Plugins	Added Hub Parties	2013-09-07 14:09:12 +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	Added DynamicServer for bungee.	2013-09-05 02:11:47 -07:00