Bukkit Plugin "VirtualPack".
Because VirtualPack (still) builds against CraftBukkit code (and I haven't managed to change that yet), and CraftBukkit builds are no longer available, you'll have to bring your own server jar.
Steps to build:
0. Have mvn all set up.
1. git clone https://github.com/Siguza/VirtualPack
2. Determine which version folder to use. The folders are named after the first supported version,
so if you want to compile for 1.8.6 and there are only folders for 1.8.8 and 1.8.4, use the 1.8.4 one.
3. Copy your server jar to VirtualPack/<version>/lib/spigot.jar.
4. cd VirtualPack/<version> && mvn