TooCool - displays cooldown of abilities on your action bars. Currently only supports FlexBar and the default Blizzard action bars. However, adding other bar mods is easy; take a look at GenerateFlexBarButtonList() and GenerateBlizzardButtonList(), the calls are made in the OnEnable() function. Essentially, you make a function which returns a table of strings which contains the button frame names that you want to add cooldown count to.
It is set up by default to only support Flexbar, if you use the Blizzard bars, uncomment line 21. Additional configuration methods are forthcoming.
Not sure what CooldownCount you ace2'ed, but if it only supports 2 mods it wasn't the best (would call OmniCC the best non aces cooldown count) one I guess. Anyway, nearly 1 month ago hshh released his ace2'ed cooldowno count, that works like OmniCC with nearly all bar mods out of the box