Vyew takes seconds to set up. Even with its free plan, you have sophisticated controls over the rights of what each participant can do, along with comments, real-time text chats, and an integrated audio conferencing service. Vyew doesn't have a separate mobile client. Since it uses Flash, it won't work in iOS-based devices, and it didn't respond well in my Android phone's mobile browser. But you can't argue the price: there is a free plan for up to 10 participants at a single conference. Vyew also has fee-based versions.