Ear Training Resources?

Working through basic music theory course, and at the end of notation there's a part where the note is written on the stave and you select the note on the bottom and the piano plays that note.

Can this be reworked into an ear training resource?

Perhaps I'll see there is one later in the courses, but for now I'd thought I'd ask.

Also, do you have any solid resource recommendations for ear training for singers?