Swords:
Withering - Chance to apply withering
Poisonous - Gives you a chance to apply poison
Lifesteal - Gives you a chance to steal some of the enemy's hp
Experience - Gives you more experience from killing mobs
Beheading - Gives you a chance to get player heads
ShardFinder - Gives you a higher chance to get enchant shards.
Worms - Gives you a chance to apply hunger to enemy's

Tools:
Expedition - Gives you extra XP for mining
Haste - Whenever you hold the tool it gives you haste
OreMagnet - Makes ores pop into your inventory
Reward - Gives you a chance to earn some cool rewards when mining
Crushed - Gives you haste when mining obsidian

Bows:
EggShooter - Joke enchant makes you shoot eggs
Restoration - Its essentially a lifesteal for bows

Armor:
Abandon - You have a chance to get speed when getting hit
Fireproof - Negates all fire damage
Glowing - Gives you nightvision
Jump - Gives you jumpboost
Molten - Has a chance to catch an enemy on fire after hitting you
Saturation - Never eat again
Undead - Negates mob damage unless you hit them