it looks like it's either
ag_UnitFrames or
Pitbull for the unit frames, pretty sure it's ag_Unitframes though.
the bottom panel is
eePanels i can see from the fubar plugin.
the party/raid frames in the bottom right is
Grid, and the buff's frame at the top right is
ElkBuffBars which is also on the fubar.
other addons are
Fubar
Bartender3 - the action bar mod
SWStats - the damage meter
and either
RicoMiniMap or
SimpleMinimap
Sct - the scrolling combat text
Prat - the chat mod
and possibly
TinyTip for the tooltip mod
they have a bunch of others too, like oRA2, DeuceCommander, BigWigs, ClosetGnome, and DrDamage that i can see on the fubar, but thats about it.
hope this helps