Mining is a skill focused around mining stone and ore. A notable perk of this skill is the higher potential yield from each ore, increased even further when using an active skill.
Woodcutting is a skill that is based around chopping trees down with an axe. Levelling the skill gives you increased chances of extra wood dropping from trees, as well as extra duration on the tree feller ability.
Herbalism is a skill in McMMO that governs the ability to harvest plants and crops. It requires multiple tools to make the full use of its abilities.
Excavation is the ability in McMMO related to using a shovel to dig anything on the soil chart, including exotic materials like Soul Sand. High-level Excavators can produce diamonds from dirt easily.
Fishing is a skill which increases the chance of finding catches, and can pull up useful loot. It also has the Shake ability, which pulls drops from mobs without having to kill them.
Unarmed is a combat skill; it uses the player's empty hand as a weapon. It includes many perks, such as disarming, deflecting arrows, higher base unarmed attack, and more.
Archery is the skill in McMMO corresponding to the use of bows as ranged weapons. It lacks an active ability but has passive utilitarian and support abilities.
The Swords skill in McMMO includes abilities which allow you to add Rupture effects to your attacks and counter the enemy's hits.
Axes is a skill based on using the axe tool as a weapon to fight mobs and other players. It adds more variety to gameplay by introducing a new type of weapon viable for many situations.
Taming is a skill in McMMO that enhances Minecraft wolf taming. As your level increases, your wolves will gain abilities that increase damage, defense and more.
The Repair skill can be used to repair tools and armor, utilizing a block of iron as a special tool.
Acrobatics is a skill that allows players to negate fall damage, and even negate combat damage via high level passives.
Alchemy is a skill based on brewing potions. It is leveled through the creation and modification of potions in a brewing stand, and can allow creation of potion types not normally attainable in vanilla Minecraft.
Salvage is the ability to reclaim the base materials from tools and armor.
Smelting is a skill that increases fuel efficiency and even enchantment experience earned via smelting.