DimDim not only offers free sign-ups for those wanting to host seminars for up to 20 participants, but offers up its hosting platform for free as an open source package, for those with the server space to do something with it. DimDim doesn't ask much more than a username, email, and password, and only from the host—those you invite to join only need to hit a connection link in the email that gets sent out when your webinars are scheduled and then starting.
In all, I found DimDim to give its free users a surprising amount of flexibility and functionality for the price, and would be interested to find out what options set apart the other webinar-hosting companies in the field.
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