I have 2 or 3 "multi" tool kits. Each one has a motor that attaches to a drill, jig saw, and a third tool (I'm thinking a sander) and they come in a metal carrying case that has room for attachments and supplies. Your tools look like that kind rather than the other drill motor attachments.
Single jig-saw, angle attachments, circular saw, drill press, sanders and other attachments were made for drill motors. In fact the earliest drill motors look like motors with a jacobs chuck attached. Simple switches, speed reducer mechanisms, and handles complete the motor modifications to make the drill motors.
I know one of the kits I have is a Montgomery Ward's. The kits are complete with ads & literature. I'll put them on my list of stuff to do and try to get some pics to post.
All of these kits make more sense, at least for me, after reading Scott G's reply on electric motors in a post about Dremel motor kits.
Chilly