I'll chip in late here...
Astratel has "19 cent untimed" calls to a bunch of destinations (22 countries) - first 60 minutes for 19 cents.
Pennytel as "15 minutes free" to 30 countries (but not shown as tested working in the sticky).
Voipbuster/stunt shown as working (free PSTN calls to a bunch of countries).
I don't think you can get true untimed calls, but you can get pretty close - say voipstunt and astratel. Costs you to maintain the voipstunt account, but other than that, not much.
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