1: https://www.serials.ws/ : the best ever website here you can get games key too.
2: https://smartserials.com/ : Recommendation huge Database
3: https://www.serialreactor.com/ : FOR UPDATED or NEw softwares highly leecher but low database
4:KEYGENPRO :very old website
5: https://keygeninja.com/ : good, but they more focus on cracks
Note: Not tested by me. try yourself!
Happy learning!
!