Those unitframes look pretty similar to XPerl/ZPerl/any other Perl clone, and probably wouldn't be difficult to recreate in Shadowed UF, Stuf, or PitBull4.
The border appears to just be the default tooltip border, so pick any minimap addon that lets you apply a border texture, and tell it to use the Blizzard Tooltip style.
The cooldown bar next to the party frames was probably Forte back then; today your main options are
CoolLine or SexyCooldown, though most "everything cast/buff related" addons like Raven and Ellipsis also provide that feature.
You can move the quest tracker with
Who Framed Watcher Wabbit?.
Damage meter - Numeration, Skada, Recount, Details, etc.
Pretty much everything else in that screenshot just looks like the default UI.