Amulet Map Editor - The Amulet Map Editor is a new and innovative Minecraft map editor made by the Amulet Team, a team formed by the contributors that brought you MCEdit-Unified
WorldGuard - Minecraft Plugin - WorldGuard is a powerful plugin with a large bag of tricks for server owners, server map makers, regular survival servers, and everyone in between!
Wurst - Minecraft open source hack
MCEdit - MCEdit is an open source world editor for the popular game Minecraft.
GriefPrevention - Minecraft Server Plugin - Stop responding to grief and prevent it instead. Grief Prevention will solve your grief problems without a roster of trained administrators, without 10 different anti-grief plugins, and without disabling any standard game features.
Badlion Client - Custom minecraft 1.7.10, 1.8.9 and 1.12.