Useful programs to learn songs by ear

Hi, everybody. I'm from Brazil and this is only my second day here.Do you have some program that can be useful to learn songs by ear? I'm still a beginner but I guess it won't be a problem to try to learn some songs by ear. I always searched for the song tab on google but I guess this habit is not helping me at all. Sometimes I think that my ears are not so "well trained". So, since I never learned any song by ear, I thought it might exist some program with some usefull stuff in this case.Do you have any recommendation?