Here you will find some of free softwares to transcribe interviews: http://www.adweek.com/socialtimes/best-free-interview-transcription-tools/186227
That is free too: https://transcribe.wreally.com/
More Free Interview Transcription Tools
Transcriptions (for Mac): “Media with tape behavior, Customizeable media-control shortcuts(->shortcut recorder), Timestamps, Text substitution and Footpedal-support”
Express Scribe Free (Windows or Mac): “The free version supports common audio formats, including wav, mp3, wma and dct. Download the free version of Express Scribe here. You can always upgrade to the professional version for proprietary format support, including ds2 and mvf.”
A friend and I just created a simple web application with the best transcribing tech out there and it is super simple. We currently have more than 80 languages available. We made it affordable to everyone at €0.09 / minute.