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 723b57cd46 Added paintball gun Gadget ... Added bat blaster Gadget Halloween Game near-completed Added SSM Witch		2013-10-26 19:01:26 +11:00
Maps	Bob wants to play!	2013-08-29 15:55:49 +10:00
Plugins	Added paintball gun Gadget	2013-10-26 19:01:26 +11:00
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	Prepping filterChat and CoreClientManager for mysql	2013-10-23 16:36:13 -05:00