We are looking to use EWay payments in conjunction with Payment form, Joom donation and possibly Event Manager.
do your EWay payment plugins offer the option of the 'shared' payment method (i.e. where the customer is taken to the EWay site for entry of card details etc and therefore don't require SSL on our own site?)
Right now, the Eway payment plugin in all of our extension use direct payment method. That means customers enter credit card information directly on your site to process payment (customers won't have to be redirected to Eway). So in this case, your site should have an SSL certificate.