
Miranda Wilson. Integrated Musicianship: Aural Skills - An open-source, interactive, online textbook for college-level music courses
SoundGym - Ear training for mixing engineers: EQ, compression, stereo image, gain, reverb
ToneGym - Intervals, chords, rhythms (with some gamification)
Perfect Pitch - Intervals, chords, scales, inversions
Сольфа - Музыкальные диктанты. Советую также попробовать MacGAMUT Dictation на Artusi
https://www.freemusicdictations.net/
https://listen-sing.com/, a podcast, harmonic singing
https://mtosmt.org/issues/mto.21.27.2/mto.21.27.2.chenette.html