Besides obviously, what The CW has aired since the fall of 2006 onward. For example, it's easy to assume that the subsequent Star Trek series to come after Enterprise (Discovery and Picard) would've naturally aired on UPN instead of CBS All Access.

Mostly either urban based sitcoms centered around ethnic families raunchy sitcoms crime dramas WWE or some other pro wrestling and reality and talent shows.

they could've aired a few shows that were canceled by ABC, CBS, NBC & FOX(and also in syndication) since 2013 along with the ones that POPTV, CBSAllAccess and the CW all currently airs

Would've made a great home for either IMPACT, ROH, AEW or NJPW.

my picks would be
CW'S SMALLVILLE
cw's beauty & the beast remake
Quantum leap
beast master
mutant x
second chances
wayward pines
the dead zone
THE MENTALIST
NUMBERS
Night man
seven days once aired on upn then they moved it on Fridays on fox
kale xy
under the dome
heroes
day break
moon light
forever
early edition
walker taxes ranger



Classic comedies
family matters
Step by step
home inmpvoemnt
perfect strangers
the wonder years
saved by the bell
clarion dreams
boy meets world
step by step
family ties

I don't know what shows UPN or WB Network would air today, but I know they would all mostly suck.

More likely the **** you see on CW.

I don't think it would be much different than what the CW is currently airing.

UPN would mostly air wrestling, some urban comedies and a few low-brow action series. WB would still be rolling out a string of supernatural or superhero dramas and teen soap operas with the occasional comedy thrown in.