Flexbar2, but that doesn't even have a GUI yet. Though there is plenty of documentation on the wiki for the slash commands, and I believe there is a new tool that may be included to help you plan out your slash commands before you execute them...
DrDamage works on infinibar. The way to make it work is listed in this thread once or twice (3 times maybe? :) ). You need to add drd (I think it was) in one of the text boxes (where you show where you want macro text, keybinding, etc).
I think there may have been some localization commits by random people... but according to the files page, it is on it's 26th "repackaged" zip since its last update. Everytime a library that it uses is updated, a new zip gets created. The mod isn't actually updated. You need to look at the actual revision number and changelog.
This mod was never finished! Features didn't get added, bugs didn't get fixed. Use it if you want to (I still have it installed, though I haven't used it in a while), but remember that it's gonna stay that way until jjsheets comes back or someone else picks it up.
In your bar options window scroll down. You'll see some lines where you can type stuff in with a couple other things in brackets (). On one of those lines, enter in [drd] and hit enter (each line corresponds to a different part of your button). This will put your Dr.Damage info on your buttons for that bar. If you delete something from a line, hit enter again to submit the empty field.