In The Clone Wars show, it's clear the droids can think for
Fourth class droid, Wookieepedia
C-3PO, Wookieepedia
Duel of the Droids Episode Guide, The Clone Wars
Droids (1986) 1, Wookieepedia
Droid, Wookieepedia
Battle droid, The Clone Wars
Star Wars: The Clone Wars Duel of the Droids (TV Episode 2008) - IMDb
R2 series astromech droid, Wookieepedia
EV-A4-D, Wookieepedia