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Solfege is a free eartraining program. The program is part of the GNU Project. Check the section called “Online resources” for info on mailinglists and where to get the latest version of Solfege.
One of the ideas of this program is that you can extend the program without having to dig into the source code. If you for example want to practise some special chords, you can write a lesson file yourself. Reading the files are pretty straight forward, and the recommended way to get started is to copy one of the existing files, and start modifying it. If you create good lesson files, you really should consider contributing them by sending them to the mailing list so they can be added to the next version of this program.