Appendix: Apps for Free Calls to Regular Phones

I reviewed a bunch of apps (Google Voice, Skype, Line2 and so on) in the column. But in the hours since the column was posted online, readers have flooded my in-box to let me know about some other options. In some cases, these additional apps disprove my thesis that “there’s still no app that offers all three of these elements: free calls, to regular phone numbers, from your cellphone.”
Here, then, is an appendix to today’s column.