Many different companies support VoiceXML and XHTML+Voice by providing various development tools and in particular IBM and Opera Software.
opera | Metropolitan Opera | Royal Opera House | software | Sydney Opera House | Vienna State Opera | San Francisco Opera | New York City Opera | The Phantom of the Opera (1986 musical) | The Threepenny Opera | Opera | Doctors (soap opera) | Falstaff (opera) | Paris Opera | Application software | Royal Swedish Opera | Opera Australia | Lyric Opera of Chicago | id Software | Boris Godunov (opera) | The Beggar's Opera | Tannhäuser (opera) | Santa Fe Opera | opera house | Houston Grand Opera | Eclipse (software) | Zurich Opera | Opera North | Dallas Opera | English National Opera |
Even though the fonts are available from some third-party web sites (such as an anonymous SourceForge project) and are included with Mac OS, Håkon Wium Lie (Chief technical officer of Opera Software) cited the cancellation of the project as an example of Microsoft resisting interoperability.
The project is a collaboration among Adobe Systems, Apple Inc., Facebook, Google, HP, Microsoft, Mozilla, Nokia, Opera Software, and W3C, who are called "stewards" of the Web Platform project.
An older version is available at the personal site of Opera Software's CTO, Håkon Wium Lie.