"Sorry, MainActor is no longer available at our website."
http://www.mainactor.com/
In my opinion, this is a good thing. At its best on the Linux platform, Mainactor was a servicable utility for basic cut editing. Most of the time, however, it was riddled with bugs, non-intuitive, and slower than a compositor. It never supported industry leaders Fedora or RHEL. Tech support shut down their bulletin board a while ago because they tired of hearing complaints about how terrible this application performed, and when it was open it was populated by one stubborn German programmer.
For $200, Mainactor aspired to achieve Adobe Premiere 6.0's functionality. Final Cut and Adobe Premiere Pro 2.0's appearance on the market totally blew away also-ran professional editors. I'm in favor of killing off the poor efforts, open-source or commercial, that give Linux a bad name (Jahshaka's next...). I work in this operating environment for stability and performance!
Considering that Linux has the best memory management around, it's an utter shame that you have to spend $80,000 for Smoke or suffer under the user-hostility of "Heroine Warrior," Cinelerra, to edit HD or higher-res motion pictures. I am impressed with the CVS Cinelerra initiative. If they can pry its release schedule from its weirdo founder we'll all be the better for it.