Adds a real endgame to Hytale: 4 phased bosses, 16 elites, 3 dungeons, the Luminia dimension, quests, 55 ability runes, rideable pets, temporal portals and 160+ items. Free, configurable in-game, with an in-game wiki.
Oreganized is a mod focusing on adding new ores and metals to Minecraft. Currently it adds, Lead and Silver as base metals and a new alloy known as Electrum.
CraftTweaker allows modpacks and servers to customize the game. With CraftTweaker you can change recipes, script events, add new commands and even change item properties!
Adds a lot of aggressive mobs, with their unique properties that can diversify and complicate your survival. Also adds new structures, equipment, blocks and achievements.