A number of companies (Voipstunt and related) offered the opportunity to set up (muiltiple) accounts and make a limited number of free calls, without having to add credit to the account.

Are there still any out there, as these offers seem to have disappeared ?

I use VOIP only infrequently when travelling to some destinations, just to make a couple of quick calls home, so do not want the hassle of setting up a permanent account, with credit that expires, etc.