These resources are available to instructors of university and college courses involving VoiceXML training and research. These resources include:

  • Commercial grade software: software platforms, development environments, tool, example VoiceXML applications, grammars, audio files, and subdialogs available via academic licensing from a commercial VoiceXML vender. Vendors are encouraged (but not required) to not charge a fee for the academic license.
  • Online services: online development environments, documentation, and/or hosting services provided at low or no cost.
  • Contributed freeware: software platforms development environments, tool, example VoiceXML applications, grammars, audio files, and subdialogs downloadable without a licensing fee from universities and individuals.
  • Teaching resources: course syllabus, lecture notes, sample test questions, example projects, training materials contributed by instructors and others, downloadable without a licensing fee

Anyone, including VoiceXML platform vendors, university professors, students, may be listed on this page by submitting a written application to The application should include the following:

  1. The name of your organization
  2. Name of your package
  3. Description of the package contents
  4. Web site where the package can be accessed
  5. Summary of the licensing requirements

A committee of VoiceXML experts will review your application, and determine if it is appropriate to be posted on this web page. Criteria for acceptance includes accuracy of the descriptions, usefulness in university courses dealing with VoiceXML, and (for commercial offerings) discount over normal licensing fees. The VoiceXML Forum makes no guarantee as to the accuracy of this information.

Organization Name Software Package Brief Description Web Site for Downloading and Summary of Licensing Requirements
Carnegie Mellon University CMU Sphinx Real-time continuous speech recognition system Sphinx is released under a BSD-type free software license. It includes core recognizers, acoustic training scripts, and free acoustic models.
public domain (GPL) CCXML4J CCXML4J is a CCXM interpreter in Java. It is independent of the telephony infrastructure and provides mechanisms to integrate with telephony APIs, e.g. based on the JAIN specifications. Work on CCXML4J is in progress. The current version already implements most of the latest CCXML specification. Included are Junit test cases and a simple example how to connect to and how to use JAIN-SIP.
Internationaler Medienverbund PublicVoiceXML PublicVoiceXML is a VoiceXML 2.0 browser, designed to work also on low cost telephony hardware using DTMF navigation with hooks to 3rd party TTS Modules. VoIP support is under development. PublicVoiceXML is licensed under the GNU General Public License. However, since we have already been contacted by interested commercial companies that want to use publicVoiceXML’s source code, we decided to offer them another license apart from the GNU GPL.
Phonologies (India) Pvt Ltd. Oktopous PIK (CCXML Platform Integration Kit) Oktopous is a CCXML interpreter independent of telephony environment and VoiceXML dialog servers and provides a flexible high-level API to integrate with any platform of choice. It is a C++ implementation of CCXML 1.0 Working Draft. Oktopous is released under BSD-style open source licensing model, Phonologies public license. For full text see this link:
Vocalocity OpenVXI 3.0 The OpenVXI 3.0 VoiceXML interpreter is a portable open source library that interprets the VoiceXML dialog markup language. It is designed to serve as a reference for parties interested in understanding how VoiceXML markup might be executed. Redistribution and use in source and binary forms, with or without modification, are permitted provided that redistribution of source code must retain the copyright notice, the provided list of conditions, and disclaimers. Full details are included in the distribution.
University of Edinburgh and Carnegie Mellon University Festival Speech Synthesis System Real-time continuous speech recognition system Festival is released under a BSD-type free software license. Includes Core synthesizer and a number of free voices. Tools to construct new voices are also included.