We use this free program when we explain and compare the systems of vowels. It is about American, British and Russian systems. In fact the program is a set of pictures. But every vowel has its own button; and thus every sound can be very easily recorded and played. Buttons allow you to compare different sounds. The program also has a convenient connection to Wikipedia. You can read there about every vowel. When the movies with examples of every vowel are ready, each button of a vowel will have a connection to its movie. That work has not been done yet.
Left button – listening to the sound
Middle button – rerecording the sound
Right button – movie with examples of the sound (movies are not ready yet)