Energy management skills

Warrior Skills
To compensate for lack of energy regeneration and having elite energy management skills, many Warrior skills are instead fueled by adrenaline.

Ranger Skills
In addition to skills that provide energy, Rangers have Expertise which reduces the cost of many skills

Monk Skills
Monk skills don't provide much energy management, except through signets which do not cost energy. There are a few skills that reduce energy cost for a period of time. Their primary attribute Divine Favor will make all their heals stronger, thus making a primary monk more energy efficient than a secondary using the same skills. Often monks will use a secondary profession for energy management.

Necromancer Skills
In addition to skills that provide energy, Necromancers have Soul Reaping which provides energy on deaths. Many Necromancer energy management skills benefit allies instead of the caster.

Mesmer Skills
Mesmer energy management tends to be more active, requiring casting of other spells (Lyssa's Aura) or interaction with an enemy(Energy Drain, Power Drain).

Elementalist Skills
The primary attribute of Elementalists is Energy Storage which provides +3 energy per rank, allowing Elementalists to have large energy pools. In addition, skills like the attunements provide energy back on spells.

Assassin Skills
The primary attribute of Assassins is Critical Strikes which provides energy on critical hits. Skills that improve attack speed and critical hit chance can improve their energy management.

Ritualist Skills
Ritualists have many energy management skills that rely on spirits, weapon spells, or bundles.

Paragon Skills
In addition to skills that provide energy, Pargons have Leadership which provides energy for allies affected by shouts and chants. Using adrenaline-based shouts and chants gives a Paragon plenty of energy.

Dervish Skills
The primary attribute of Dervishes is Mysticism which grants energy and health on enchantments ending. In addition, energy management skills for Dervishes rely on attacking the enemy (Zealous Scythe, Zealous Vow) or enchantments (Arcane Zeal, Pious Renewal).