Qualitative Data Analysis systems. RQDA and QualCoder are under development, but the pace is generally slow and many features are buggy and remain untested on common operating systems. Some products out there on the market are better than others (I use MaxQDA) but come at a hefty price, even with a student discount.

Also transcription software. Not voice recognition, but software that assists with manual transcription. I'm amazed that no open source alternative to F5 exists out there, since it's a relatively simple mechanism (keyboard shortcuts to denote speaker, paste timestamp, include annotations, etc and ability spool back to rewind 2 seconds).