Mech Rehabilitated is a modded SMP just came back with a fresh version of the modpack and a clean slate. It looks like a chill place to hop on after work or classes and play with a small friendly group.
The pack is huge with 300 plus mods so there is a lot to do. You can explore and loot big structures fight bosses keep getting stronger. If you are more of a peaceful player there is also plenty of farming and cooking stuff to mess with.
I saw it includes things like Create Alex style mobs and caves Terramity Farmers Delight Cataclysm Productive Bees The Aether Quests spells Tinkers Construct and more. To join you fill out a short whitelist form and they review it so you can get in.

