To add to what oldgoaly said, in the 1950s there were lots of these things offered. Motors had become far more compact due to development work done during World War II, and the tool companies were offering lots of choices; but many families were operating on tight budgets (in many families, it was a Big Deal to get a car). So some inspired geniuses decided to make these attachments, figuring the homeowner could afford a drill, and the attachments were then cheaper than buying a circular saw, saber/bayonet/jig saw, etc.
They do work, but generally not well. They tend to be underpowered, and the ergonomics are not the best. I fooled around with the circular saw attachment I picked up at a yard sale, and yes, it would cut 1x stock; but more slowly than a handsaw would. That hasn't stopped me from buying a couple of other attachments as I find them, just because they're interesting; but I don't expect ever to use them.
