From the PlayMyth Website:
FlyingFlip is pleased to present Ballistic v1.0 to the Myth community. Drop by the <a href="http://www.flyingflip.com/downloads.pig">FlyingFlip.com web site and download page</a> for complete details on getting the fully functional, cross platform tool for Myth III. Be watching for important news regarding Myth III shortly.
If you are a map maker and would like some help or support from others in creating things for the Myth III engine, drop by the <a href="http://www.flyingflip.com/forum/">support forum</a> and have all your needs met...... sorta.