Datapacks are small minor changes to the game while plugins are typically larger and more command focused tools.
Geyser makes it so people on console or Bedrock Edition Minecraft can join the server. Consoles require a few extra steps, but any device can join, no matter what kind of game you're running. Bedrock or Java, it all works!
JustTPA gives players the ability to teleport to eachother. Also allows the player to return within 5 minutes.
Allows players to set up to 3 homes. You can teleport to each one at any time, but you can't get back where you teleported from!
Speeds up the process in which leaves disappear, making replanting easier.
All of these plugins are primarily for administation stuff.
Quicksave keeps backups going back over a week just in case someone unkind joins the server.
WorldEdit is useful for repairing broken things, building structures quickly, and is required to run WorldGuard.
WorldGuard protects spawn, and saves bases for future server iterations to come back to and view.
Shows offline players as offline.
Allows you to mix Elytra and Chestplates to gain the benefits of both at once!
Allows you to put Coordinates up on screen without the bulky F3 menu.
Just like it says on the tin, different shaped custom portals.
Allows sleep when some players can't make it to bed.
Colourful names! yay!
Tools to help make creating a villager trading farm. Allowing you to see when a villager dies, and which Workstation a villager is tied to.
Guarantees 2 shuker shells will drop on kill.
This is a big one, though not complicated. Drop a Gravestone on death instead of all your items. Die in lava? Fall to the void? You have a chance to get your stuff back.
Some blocks with no proper tools for faster harvesing now have tools that will spead up the gathering process.
