Project Ozone 3 (Kappa Mode) 3.3.61 on the maelstrom server. This is a Skyblock setup built around the Project Ozone 3 pack, so expect the usual progression grind and all the weird pack stuff that comes with Kappa Mode.
If you want to make getting around easier, you can use the handy commands like /tpa, /sethome, /home, and /back. That makes teaming up and moving between islands a lot smoother, especially when you're working with friends.
There's also an online map available for the server, so it's easier to keep track of what's going on and find your way around. Welcome to maelstrom:)