ReelPortal.com (BETA) is a Flash-based video conference software. Thus, using a web browser with Flash 10 plugin, users of different Operating Systems (Linux, Windows, OSX) can talk to each other without installing any software. The software is free to use for anyone. No registrations necessary.
As with any beta software, you may encounter bugs. Please report it here in the comment section. Also, do bring up features that you'd like to see implemented.
Thank you. Enjoy.
Short intro clip: http://www.youtube.com/watch?v=3z5QeKKEqig