Better option, I asked around the office and they said our sister department has tried GoMeetNow for emergency meetings with outside clients. See their claims here: http://www.gomeetnow.com/web_conferencing/no_download_web_conference.html
I've never personally used this and we are happy with software based solutions, especially app based software.
http://www.gomeetnow.com is a good online collaboration tool that also provides audio conferencing for its users. There’s no upper limit for audio conferencing feature, though you do have to add your participants in multiples of 5.
There’s another alternative to GoToMeeting/GoToWebinar. Though, http://www.gomeetnow.com doesn’t natively support Linux hosts yet, it works on Wine. Your meeting invitees also can view your meetings through any web browser on any platform.