According to plugin.yml embedded in it, it seems to be LeakSkyWars, version 2.0.0
The current latest version is available here: https://www.spigotmc.org/resources/leak-sky-wars.18568/ for $20.00 USD.
The most updated version is 2.0.02
Minecraft Leaks
LEAK SKY WARS
Submitted by LunaRenzoX, 03-04-2018, 10:46 AM, Thread ID: 82836
Thread Closed
RE: LEAK SKY WARS 07-04-2018, 09:37 PM #5 "It never hurts to keep looking for sunshine" - A. A. Milne
07-04-2018, 09:37 PM
#5