TRANSANA has been comercialized and is no longer available for free. There is no free demo available. However older versions are still available for free from the archive: http://www.transana.org/download/archive.htm

Transana is software for professional researchers who want to analyze digital video or audio data. Transana lets you analyze and manage your data in very sophisticated ways. Transcribe it, identify analytically interesting clips, assign keywords to clips, arrange and rearrange clips, and share your analysis with colleagues.

Transana works on both Win and Mac.
The mac version is alpha because it supports only limited number of audio codecs. despite it works well and is stable!