This FFA & DUELS Setup is the best one out there with Advanced Progression with Skills + Leveling. This setup has much more progression than competitors! The native server version is Paper 1.21.10 but you can support all modern versions with ViaVersion, this setup works on Java 21.

A fully configured Skyblock premade setup designed for a smooth and optimized experience. Includes custom island generation, spawn, shop, upgrades, missions, economy system, leaderboards, ranks, crates, and essential quality-of-life plugins. Perfect for both small and large communities, with balanced progression and performance tweaks. Fully compatible with Paper 1.21.8 Native and runs seamlessly on Java 21.

A Murder Mystery minigame server setup, just like Hypixel's Murder Mystery. In the game there is a Murderer, a Detective and the rest of the players are called innocents. The Murderer's job is to find and kill all the players. The Detective's job is to find and kill the Murderer. Innocent players have to either survive or collect enough gold to get a bow and try to murder the Murderer to win. It works on Paper 1.20.4, Java 21.