Back in Cataclysm I used to have an addon that announced what raid cooldowns etc were used and when they ended in raid chat, not just my own, but the whole raids.
Agreed with above poster, that looks a lot like Flump. Afaik it hasn't been updated by the add-on author since Cata but should still be usable with some lua workarounds and additions.
I was in the same guild as the author, and he stopped playing after cata, so thats why it isnt updated after. But shouldnt be to hard to adjust it to work in MoP