Well I've put the Rogue at the bottom of T3 and I think both Bard and Factotum are firmly in this tier, too - spells, skills, skill points, some nice class features and a few decent ACFs for the Bard.

So Bard T3, Factotum T3.

Bard might very well be capable of jumping up a tier with some additions, but not on his own, without PrCs.

No experience with Jester, at all, so skipping this one.