Posting from rec.crafts.metalworking as always:
2617) These look like counterweights for something. Likely theater curtains at a guess.They could be anchors for small craft like rowboats, but the rings on some of them could rust away in a season.
2618) Given the size (too small for a flashlight bulb) I'm going to guess that this is a solar-powered cigarette lighter -- it focuses the heat of the sun on the end of a cigarette placed through the hole.I guess that it could also be used to light a fuse on an explosive device at a particular hour if set up right.
2619) O.K. The second could be used as a plumber's snake, but the first one looks more like something designed to feed through a pipe and then (as the orange device springs out from passing through the pipe, it will hook on the end and when you pull back, it will turn at right angles, and pull on the whole of the pipe.The angle of view of the first one does not make it clear whether it is a steel tape, or a wire, but the function would be similar. The wire would be harder to grip and pull on without gloves, of course. :-)
2620) A simple puzzle, missing the small ball which drops in from the left-hand end?A trap for some kind of large insect or small rodent?
2621) A travel burglar alarm? You set it like a wedge as a door stop, but in addition to making the door more difficult to open, it closes a contact and sounds an alarm.2622) Perhaps a rack for transporting a bicycle on the back of a car?
Now to post this, and then see what others have suggested.
Enjoy, DoN.