I have used Yugma for so many things. I use it for group projects, to share my files with others, for training purposes, webinars, etc... It is so easy to use, quick download and install, I have had no problems when using it. There is a free version and a pro (paid) version. The free version let's you share your desktop with your attendees, use the instant message built-in feature, and the free (with standard long distance charges) teleconferencing service. The pro account offers so many great additional features: change presenters, share keyboard and controls, share files, record the webcast, use whiteboard, and schedule sessions. They also came out with a Skype edition which is so great! There is a 15 day trial period to test out the pro features for free too, and they don't take your credit card information like other competitors do (as I have found out). I would suggest trying the free version of Yugma to test it out! It's a great service and highly recommended!
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