If you’re looking for free/extremely low-cost alternatives to online conferencing tools like WebEx, let me suggest Vyew.
Vyew is a next-generation online collaboration and web conferencing service that brings people and content together. With Vyew you can host LIVE conferences and work collaboratively on content asynchronously over time, ANYTIME.
Inside Vyew you can author new content and collaborate with PowerPoint, Word, Excel, and PDF files, plus audio, video and images. You can also stream live or capture what’s showing on your desktop. Built-in text chat and FREE teleconferencing make live collaboration sessions highly productive.
Basic Vyew accounts are free (and advertising-supported; in other words, ads appear in your online session window.) “Professional” accounts start as low as $9.95 per month.