All the current DoT and HoT timers are inactive except for DoTimer which I personally find way to complex and doesn't have all the features I would like.
What I would like for a DoT/HoT timer would be the following:
Configuration works similar to the way Pitbull 4 works where you create a frame and name it.
One of the areas allows you to type the spell ID or name and select whether it is a buff/debuff and where it should be looking (Player/Target etc).
This allows maximum customization while keeping it very simple. An example usage that I would be using on my warlock would be this:
1 frame with (currently) the following debuffs and buffs showing:
Any Warlock Curse
Glyph of Life Tap (Shows as Life Tap would probably use spell ID)
The major difference between this addon and other DoT/HoT timers would be the ability to create frames that are not locked down to only display certain buffs/debuffs from certain targets on certain bars. You can place any buff or debuff from any target (Target/Focus/Player etc) that has a timer onto any of the frames you create.
I'm currently using InlineAura. It's nice because my cooldowns, timers, and GCD are both on my action bars. The downside is it only tracks my target (versus guessing at multiple DoTted targets) and I can't always see all of my timers since I use modifier paging in Dominos.