Mr. Soundman is a bit like an arcade game with an intuitive GUI, and rapidly increasing difficulty. You start the game with three lives. Mr. Soundman will play an audio source with a noticeable boost somewhere across the frequency range. Your mission is to identify the boosted frequency. The closer you are to the boosted frequency the more points you gain.
While Mr. Soundman is free, there is also premium version which costs 29 EUR. Almost forgot – the application is standalone, PC only.
Download: Mr. Soundman – Ear Training Game