It's A Beautiful World

Adventure Backpack adds 60-something new backpacks to the game, with the ability to store fluids in special tanks and to trigger special characteristics during gameplay.

A Mod About energy, and matter and getting stuff done! Probably.

Artifice adds worldgen, new blocks, and new items. (Remind me to come up with a wittier description).

Configs for It's A Beautiful World

It makes your plant life a bit more verdant and fluffy by drawing some extra stuff on trees, grass blocks, cacti, lilypads. Also adds reeds and algae in water.

A collection of beautiful and exotic biomes!

A dependency mod for all of bspkrs' other mods, including TreeCapitator.

If you haven't heard of BuildCraft then you haven't been playing Minecraft very long.

This mod adds slopes and a custom variety of vanilla-inspired blocks to the game. The custom nature of these blocks allows players to cover them using most solid blocks in the game. Once covered, they look and act just like the block they're mimicking, but in entirely new shapes! For example, make some obsidian stairs that are resistant to explosions. Or, make glowstone take the shape of a pyramid top. With Carpenter's Blocks, building takes on new possibilities!

Chisel adds a huge variety of static blocks to the game. This mod will be very useful for people who like the construction aspect of Minecraft.

A dependency for all of ChickenBones' mods.

The dependency for all Team CoFH mods, with custom ore generation, flat bedrock, and much more!

Adds awesome dungeons to the world of Minecraft!

Dynamic light sources such as a torch in your hand, able to light up the world without even being placed!

ExtrabiomesXL is a collaborative open source mod for Minecraft which adds new biomes and an assortment of natural blocks and items that enhance gameplay and make exploring fun and interesting.

Galacticraft allows you to explore the solar system in your own spaceship. It features the abilities to:
Create and customize your very own spaceship!
Explore new planets and moons!
Space Races - Create Teams, Flags, with Stats!
Electrical and Oxygen System!
SMP Support - Explore with your friends!
New mobs!
Lots of new items and blocks!
Dungeons!

This client mod allows you to easily manage your inventory, in both single player and multiplayer. It works out of the box, and will make you gain a massive amount of time!

Jabba (Just Another Better Barrel Attempt) is a storage mod aiming at making a better barrel than what is already out there. It introduces one block (the barrel itself), a set of upgrades and a dolly to move things around.

Every get bored of mining all the time for resources? Want a new way of collecting them? Magical Crops gives you the ability to grow your own resources! Grow Diamonds, Coal, Emeralds or even Experience, Now go and create a vast farm for all your needs!

This contains shared code for Forge mods and is used by the Slime Knights. Descriptive book code and common inventories are found here.

Mekanism is an independent tech mod that brings low, mid, and high tier machinery to Minecraft. The mod doesn’t have an actual goal, and you’ll understand this when you see all the random content Mekanism contains, from jetpacks to balloons. However, I can assure you that you’ll notice all the content blend together as you get to know the mod better!

This is one awesome automation add-on for Minecraft!

Natura is a mod that aims to spice up the world with interesting worldgen. With a few small additions, hunger no longer has to be about hunting animals early game. The mod is mostly intuitive; everything should be sensible or explained in-game.

Ores in the Nether! Coal, diamond, gold, iron, lapis, redstone, tin, copper, emerald, silver, lead, uranium, and nikolite. Non-vanilla ores only spawn if a mod that uses them exists. All nether ores turn into their surface counterparts in a furnace - some (like redstone or coal) may need to be smacked with a pick or macerated to be made useful.

NEI is a successor to both Too Many Items and Recipe Book. It arose around the same time as Craft Guide when Alexandria and a few others on the IRC suggested that I merge both Too Many Items and Recipe Book to remove their greatest flaws, ironically too many items, or in the case of recipe book, too many recipies. Too Many Items was great, but the one thing it lacked was an easy way to search and sort your items. When you had a mod like Red Power coming along with 10000 items both TMI and Recipe Book were racking up the pages. Even if you don't want to use NEI for cheating in items, you will likely feel right at home with the Recipe component of the mod.

This mod makes pumpkin seeds, melon seeds, carrots, and potatoes drop from tall grass at a very low frequency in addition to wheat seeds. Use the config file to turn off non-wheat seeds dropping or change their frequency.

This mod is meant for folks who like to play on Peaceful or who have taken mobs out of their game some other way. Bushes spawn in the world that when broken, drop a mob item. Blaze Flowers and Tear Chalices can only be found in the Nether. You can then take that mob item, combine it with wheat seeds, and get a mob drop seed.

This mod currently adds in a venus fly trap plant that generates in swamp biomes. They deal damage like cacti when bumped, but you can break them and re-plant them where you'd like.

This mod adds several crafting and smelting recipes to the game.

This mod adds in sixteen new plants that spawn in Forge Biome Dictionary biomes marked plains, forest, mountain, and hills. They are just for decoration and be planted on grass.

Pam's Weeeflowers

Shaders mod for Minecraft with Sildur's shaders included.

Thaumaturgy is the capability of a magician to work miracles. A practitioner of thaumaturgy is a thaumaturge, thaumaturgist or miracle worker. This is what this mod is all about - drawing magic from physical objects in the form of Essentia and reshaping it to perform miracles.

This mod allows you to chop down an entire tree (leaves and all) by harvesting one of its logs. Based on Terraria tree-cutting style.

Waila is an extension for NEI. It will show in the tooltip what mod an item is from. Since the tooltip contains the mod name, you can also easly parse items per mods.

An awesome minimap mod for Minecraft.