Evans caught four passes for 94 yards and a touchdown last season.
Smith was waived by the Eagles the day prior.
Hardy re-signed with the Bills after being released on Tuesday.
Hamler was signed after being left off the 53-man roster on Tuesday.
Cuts were made as NFL clubs announced their 53-man rosters.
The Nittany Lions are still trying to narrow down the right tackle spot between Nolan Rucci and Anthony Donkoh.