Unfortunately, as far as I know there are no perfect tools for managing druid hots.
One would need to:
1) differentiate between your own hots and those of other players
2) be able to modify the timer duration dynamically (tier 5 set bonus increases the duration of regrowth)
3) be able to track stacks, for lifebloom
4) have an on-click ability to either swiftmend or recast for stacking
Currently I use Chronometer and Perfect Raid.
Chronometer shows durations. At a time it had click-casting, but no longer does. Really, showing hot durations in this way is entirely unpractical unless you are concentrating on a specific single target.
Perfect Raid shows which hots are on which players. However, it cannot differentiate between your hots and another druids (althougth this isn't a problem in my single-resto druid raids), and cannot show stacks. However, with Clique you can click-cast to swiftmend or re-apply hots.
Grid has the benefit of showing HoT durations, but the sever detriment of being able to handle only one HoT at a time.
