SOTCL is an RPG SMP that's fully free to play and built entirely on plugins. No ranks to buy, no pay-to-win stuff.
The main thing that makes us different is roles. When you join you pick between survivor and warrior. Survivors can't take player damage and don't PvP, so you can build and explore without worrying about getting jumped. Warriors can fight other warriors and get access to custom weapons that survivors can't use.
On top of that there's a bunch of custom content: Custom biomes, mobs, structures, blocks and items!