Pyroclasm by Grondag (aka Zaerudath)
Volcanos, lava, fiery ruination. You didn't like that base anyway...
Sheeeps! by Zulucap
When sheep go exploring they find useful material that gets trapped in their wool.
Dynamic mazes mod adds randomly generated mazes full of loot and angry wolves. Sometimes you can find there secret entrance into large underground maze filled with treasures and deadly traps.
Cyclic by Lothrazar
Random things that are useful and fun, including powerful items, inventory features, world generation, a few machines, gameplay tweaks, and more. See config to disable absolutely anything. Report issues to https://github.com/PrinceOfAmber/Cyclic/issues
Endless Traverse by MysticalHerobine
A one-of-a-kind unique experience that builds on the long loved vanilla style of minecraft.