I found this article that might provide some sources for you.  They do list
Skype as being the best and most popular though.  You just need to make sure
though that all of your potential participants have a skype account.
http://www.geekersmagazine.com/best-free-online-conference-call-services.html

Ryan Palmer
Technology Integration Specialist
MSAD#61 Lake Region Middle School


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On Mon, Apr 25, 2011 at 10:57 AM, Shawn Kimball <[log in to unmask]>wrote:

> I have been asked to set up a telephone conference call for 12-13 people.
> Can anyone suggest a free, dependable solution?
>
> Thank you in advance!
>
> Shawn
>
> --
> Shawn Kimball
> [log in to unmask]
>
> Technology Integration Specialist
> Hampden Academy
> Hampden, Maine  USA
> 207-735-3704 cell
>
> *All that is valuable in human society depends upon the opportunity for
> development accorded the individual.  --Albert Einstein*
>
>