BiomeWater - Enables biome colored water, mainly for aesthetics
ScotTools - API and fix for better compatability between new blocks from mods and tools
Randomite - Adds new ore, Randomite, which gives you a random ore when mined.
Adds advanced sleep options and simulated real time while sleeping
Renovates the default Minecraft health system to that like from the Legend of Zelda series of games.
Enables GUI style option buttons in Minecraft.
Adds a plethora of new mobs and related items to the game world
Slime Boots - Craft slime **** into boots, said boots double jump height and reduce fall damage!
Score - Pretty self explanatory. Killing hostile mobs gives positive scores while killing peaceful mobs are negative.
Starting Inventory - Starting a new game gives you predefined inventory.
Teecapitator - Trees are tougher to cut, but cutting them with axes at the root makes all the logs fall at once.
Crystal Wing - Craftable item. Using this item instantly warps you to your last spawn point. Has 8 uses.
Web Generation - Generates Webs in caves and underp****.
AudioMod - Certain mods depend on this.
Death Chest - Dying while holding a chest in your inventory will place all your items in said chest.
Shelves - Craftable shelves which are great for displaying and storing your prized items.
More Stackables - Enables more items to be stackable for balancing reasons.
More Arrows - Adds elemental arrows and a homing bow.
Recipe Book - Right clicking while holding this opens the book. Shows all available recipes in the game, including mod items
Adds craftable and ridable airships!
Magical Bone Sticks - Adds 3 different craftable magic wands with different effects and passive abilities while held. Must be crafted with gilded bone sticks first. Check your recipe book on how to create them.
Bone Torch - Adds torches crafted from bones and coal. Brighter than regular torches, and useful for when you're underground without any wood or sticks.
Biome Caves - Adds ice and sand caverns for more variety on your spelunking adventures.
More Dungeons - Adds above world dungeons which are camoflauged by trees and pyramids.
Rope! - Adds craftable ropes which are useful for climbing. Attach a rope to a ceiling and it will drop down until it hits a surface. Break the rope to get it back or cut it with a sword or axe to make specified lengths of rope.
Peaceful Pack - Adds alternatives to obtain various resources on Peaceful mode which would otherwise require killing of mobs
Adds treasure chests scattered throughout the land buried in sand
Adds SHIFT, CTRL and ALT modifiers for inventory management
Mind you, most are probably single player mods. One of them has fossils which have bones, which I like the idea of - considering we're in friendly happy mode.
That would be quite nice. I also wouldn't mind seeing a bit more vertical variety, stuff like valleys and canyons and some proper mountainous mountains (maybe when the ceiling height is raised (I didn't dream that right, it is happening?)).
I think it's happening, although in the meantime you could lower the floor next to a mountain to make it appear taller. You could even empty a lake/sea and have a ready-made valley. Emptying the sea takes quite a bit of work.
Yeah I know you could build that kind of thing with a lot of time and effort, but that's not really the point. I'd like to come across something like that while exploring and build something in/on/around/near it. I like the idea of building a house on a mountaintop (and then obviously hollowing out the mountain to make an evil lair), it can be a very beautiful game in a strange way. :')