That isn't really comparing like for like though is it, given LightPaper is _only_ available for the Mac, is a paid app (inexpensive, yes, but not free, and the site says nothing obvious about future update policies), and not open source.

If I want to make chips, fries, wedges and jackets, the fact that a cucumber has far fewer calories and goes really well in a tuna sandwich is, while true, hardly relevant!