Ultimate support
What game mode are you looking at? Druid is really the support class as far as healing goes. Chrono offers a ton of utility support. I’d look at those two
Elementalist – extremely strong healing and some condition clears and stun breaks, and a lot of defensive buffs, including powerful short duration unique defensive buffs. also decent non-unique offensive buffs
Ranger (druid) – extremely strong healing and some condition clears, and good offensive buffs, including unique persistent offensive buffs good for long term dps. also a ranged revive
Mesmer (chronomancer) – Powerful disables and crowd control, momentary invulnerability, and extremely strong offensive buffs. Also Portal (long distance transportation).
Revenant (herald) – a strong persistent boon duration buff, and any boon in the game except quickness (but not all of them at once). Can also do pretty good healing
(edited by reikken.4961)