Fletching

Allows players to make projectiles (such as arrows, bolts, and darts) and bows/crossbows which might be used for Ranged.

Slayer

Allows players to kill certain monsters using tactics which are not utilized in traditional combat. Helpful in raising combat skills. Has the potential to give very rewarding drops unique to slayer monsters. It is also useful in the minigame Soul Wars.

Farming

Allows players to grow plants (such as fruits, vegetables, herbs, or trees) in certain patches across the world of RuneScape. Farming is notably very helpful for collecting many common and rare herbs for Herblore.