This is J3B SMP1. It has a lot of random mods that add features like dragons, extra mobs, animations, extra decorational and functional blocks related to furniture and farming, dangerous dungeons and structures, cooking, backpacks, a way to improve the soil that crops grow in, ability to move blocks like chests and furnaces without removing their items inside, improved end cities, extra biomes, an extra dimension, spells, and accessories to the game.
You probably play with one or two mods, that circles around a theme. This modpack has mods of a variety of themes that you PROBABLY haven't played before. Explore the incomprehensibly modded world!