1. HTS: HMM speech synthesis toolkit, http://www.hts.nitech.ac.jp/
2. Open JTalk: Japanese text-to-speech system, http://open-jtalk.sourceforge.net/
3. Julius: Open-source large vocabulary continuous speech recognition engine, http://julius.sourceforge.jp/
4. MMDAgent: Toolkit for building voice interaction systems, http://www.mmdagent.jp/
5. T. Funayachi, K. Oura, Y. Nankaku, A. Lee, K. Tokuda, A simple dialogue description based on finite state transducers for user-generated spoken dialog content, in Proceedings of ASJ 2013 Autumn Meeting, 2-P-28, pp. 223–224, 25–27 Sept 2013. (in Japanese)